Both the S90 and the G80 are well-designed and stylish saloons, with sleek and modern exteriors and elegant interiors. However, the S90 has a more minimalist design, while the G80 has a more traditional and formal look. In terms of performance, the S90 emphasises comfort and refinement over raw performance, while the G80 offers more of a focus on sporty driving dynamics. As well, both cars offer a spacious and comfortable interior, with ample room for front and rear passengers. However, the S90 has slightly more legroom in the rear, while the G80 has a larger boot.