Awd will always be better cause of more traction but the real question is do you really need awd... I drove my m3 on the worst weather days last winter and it hanlded it like a champ. The only days I don't drive it is when the snow is too deep and I don't want to rip the front bumper off. This would also be a problem in a s5...
2011 E92 M3 | JEREZ BLACK | EXTENDED BAMBOO NOVILLO | EXECUTIVE PKG | M-DRIVE | EDC | M-DCT
MODS | KW S/O | HRE P40SC | Akra Evo |ESS Akra Tune | BMC drop in | StopTech Trophies | TMS Pulley | LUX V3