2018 BMW X6 sDrive35i and xDrive35i are almost similar trims barring that one is a rear wheel drive and other being all-wheel drive. The xDrive35i would be the best fit for your daily use and weekend warrior antics because of its versatility to be a sports car plus a go anywhere all-wheel-drive system. If you're a fan of speed and performance and do not pay much attention to the fuel economy, X6 xDrive50i will satisfy your crazy needs.