It is an interesting issue. Making the car basically FWD with an electric motor on the rear to provide AWD in a limited set of conditions, as Toyota did with the Prius and RAV4, is more energy efficient and probably cheaper, but not as effective in poor conditions. For my needs the Toyota approach is fine, as I'm mainly interested in AWD for regulatory compliance rather than needing the traction, but for people who need that extra traction on a regular basis Subaru's approach is better.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].
The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.