grifrowlB5 passats have the same awd system (center torsen differential) as "quattro" it's just named 4motion. Also the newer iterations of Haldex ain't that bad in the snow.
Have you driven a haldex car in the snow much?
The R32 i drove uses a haldex system, which I believe is what all VW's use and some lower end audi's like the TT/A3. It is NOT audi's real quattro system. might be labeled that on some of their cars, but its not what their legit high end cars use. and yes that R32 did suck, drove like a FWD car that had a little better traction. Not like the insane grip and control you get with a legit AWD system like quattro.
I've spent a ton of time driving a friends 2012 or 2013 XC70 with nice, new studded snow tires, and i've never hated a car so much in the snow, the thing would not let you do shit. understeer like crazy unless you really force the rear end to come out, and if it does, you can feel the individual wheels braking themselves attempting to redirect power, the car refuses to rotate, and wants to plow off the road if you take any speed into a corner. literally takes away any ability you would have to control the car. if you have to power out of deep snow to avoid getting stuck, the car literally gives up, it keeps braking individual wheels trying to redirect power until the car just doesnt move. we couldnt make it up a hill that my friends miata made it up. he even went first and basically "plowed" the way. but because he could basically power through it, it just chugged on up. took the XC multiple tries with a massive run into the hill to finally make it up.
havent driven any VW's other than the R32 in snow, but from what i've heard the 4motion is pretty much the haldex system. unless there is a massive difference from one cars haldex system to another, it blows. ive driven a B5 S4, C6 S6 and A6, and its a complete night and day difference in performance between quattro and a haldex system. Having driven a lot of RWD cars in the snow, Id easily take RWD over haldex, might need to keep on your toes a little more, but its honestly more capable with equal tires, especially with an LSD