Smart #5 vs BYD Sealion 7: Which Premium SUV is Right for You?

The Smart #5 and BYD Sealion 7 represent two of the most compelling Chinese electric SUVs available in the UK market for 2026. The Smart #5, crowned What Car?'s Family Electric SUV of the Year 2026, starts from £39,800 and excels in value for money, family practicality, and city driving. The BYD Sealion 7, priced from £46,990, positions itself as a premium contender with slightly faster charging and longer WLTP range. For most UK buyers, the Smart #5 offers the better overall package: it's £7,190 cheaper, has 110 litres more boot space, superior towing capacity, and lower running costs. The BYD Sealion 7's advantages are narrower but meaningful for some buyers: faster 10-80% charging (24 vs 30 minutes) and a 12-mile WLTP range advantage. Both cars represent strong choices in the premium electric SUV segment, with the Smart #5 offering better value and the BYD Sealion 7 appealing to those who prioritise charging speed above all else.

The price difference between these two SUVs is substantial and represents one of the most significant factors in this comparison. The Smart #5 Pro starts from £39,800, whilst the BYD Sealion 7 Comfort begins at £46,990 - a difference of £7,190 or approximately 15%. Over a typical three-year ownership period, this price advantage compounds when considering financing costs, depreciation, and opportunity cost. The Smart #5's superior value proposition extends beyond the initial purchase price: running costs are lower across all charging scenarios, with annual home charging costs of £640 versus £688 for the BYD (based on 8,000 miles per year). The Smart #5 also holds its value better in the emerging used market for Chinese EVs, according to early residual value data. For budget-conscious buyers or those who prioritise maximum value per pound spent, the Smart #5 is the clear winner.

Both SUVs offer competitive range figures, though the BYD Sealion 7 holds a slight paper advantage. The Smart #5 Pro delivers 288 miles WLTP from its 76 kWh battery, whilst the BYD Sealion 7 Comfort achieves 300 miles WLTP from an 82.5 kWh battery. However, real-world motorway driving narrows this gap considerably: EVGuide estimates 202 miles for the Smart #5 versus 204 miles for the BYD Sealion 7 - a difference of just 2 miles. The charging story favours the BYD Sealion 7, which completes 10-80% charging in 24 minutes compared to the Smart #5's 30 minutes. Both support 150 kW maximum DC charging, but the BYD's slightly faster charging curve and larger battery mean it adds more range per charging session: approximately 143 miles in 20 minutes versus 113 miles for the Smart #5. For frequent motorway users, the BYD's 6-minute charging advantage could be meaningful, though for most drivers the difference is unlikely to be decisive.

The Smart #5 demonstrates superior practicality despite its slightly smaller exterior dimensions. At 4,695mm long, the Smart #5 is 135mm shorter than the BYD Sealion 7 (4,830mm), yet it offers 110 litres more boot space and 850 kg greater towing capacity. This space efficiency translates to real-world advantages: easier parking in urban environments, better manoeuvrability, and more usable interior volume. The Smart #5's height advantage (1,705mm vs 1,620mm) contributes to a more spacious feel and better headroom. Families will appreciate the Smart #5's combination of superior boot space, rear legroom, and overall interior packaging - factors that contributed to its What Car? Family SUV award. The BYD Sealion 7, whilst larger externally, doesn't translate this into meaningful interior advantages and its lower roofline may feel more restrictive for taller passengers.

The Smart #5 demonstrates superior efficiency across all charging scenarios, translating to lower running costs. At off-peak home electricity rates (approximately 8.5p/kWh), the Smart #5 costs 2.5p per mile versus 2.7p per mile for the BYD Sealion 7. Standard home charging (27p/kWh) shows a similar pattern: 8p/mile for the Smart #5 versus 8.6p/mile for the BYD. Public rapid charging costs favour the Smart #5 at 23.7p/mile compared to 25.5p/mile for the BYD. Over 8,000 miles of annual driving with home charging, this amounts to £640 per year for the Smart #5 versus £688 for the BYD Sealion 7 - a saving of £48 annually. Over a typical three-year ownership period, this accumulates to approximately £144 in fuel cost savings alone. When combined with the lower purchase price, the Smart #5's total cost of ownership advantage becomes substantial.

Both brands represent strong Chinese automotive manufacturing with different approaches to the market. Smart is a 50-50 joint venture between Geely and Mercedes-Benz, combining German design prestige with Chinese manufacturing efficiency. Chinese market data from 车质网 shows Smart #5 has a complaint ratio of 35.1 per 10,000 units with 28 total complaints (2024-2026), mostly minor electrical issues typical of new model launches. BYD is China's leading EV manufacturer with vertical integration spanning battery production to vehicle assembly. The BYD Sealion 7 benefits from BYD's proven Blade Battery technology and established track record in electric vehicles. Chinese market feedback for BYD models generally shows strong reliability and owner satisfaction. Both manufacturers have strong financial backing: Geely (Fortune Global 500) and Mercedes-Benz for Smart; BYD's dominant position in China's EV market for the Sealion 7. UK long-term reliability data is limited for both models given their recent market entry, but Chinese market patterns suggest both should prove reliable.

The Smart #5 emerges as the winner in this comparison for most UK buyers, offering superior value, practicality, and overall package. Its £7,190 price advantage, 110-litre boot space benefit, 850 kg towing advantage, lower running costs, and What Car? award make it the compelling choice. The Smart #5 is particularly well-suited to families who need maximum practicality, budget-conscious buyers who want the best value per pound, and urban drivers who will appreciate its smaller exterior dimensions and easier parking. The BYD Sealion 7's advantages are narrower but meaningful for specific use cases: its 24-minute 10-80% charging time (versus 30 minutes) and 12-mile WLTP range advantage will appeal to frequent motorway users who prioritise rapid charging above all else. However, for most buyers, the Smart #5's comprehensive advantages across price, practicality, running costs, and award recognition make it the recommended choice. The BYD Sealion 7 remains an excellent option for those who specifically need its charging speed advantages or prefer BYD's established EV pedigree.