UKPassats

I currently own a B6 tdi sport and i am due an change as i have had it for 6 years. I am looking for an estate next and really like the alltrack. So a couple of questions:

Anything i should look out for when viewing?
Is the 4motion any good in snow / towing on a field?
Will i notice much difference in anyway compared to my B6 saloon?

cheers