neither, part support is going to start to dwindle. Fk05 is based on T1 suspension, the T2 is now onto there 4th chassis model. My local shop got stuck with a bunch of T1 parts but if you look online few shops carry T1 parts anymore.
Tamiya well i wont comment. Other then it may have more in common wiht the 416 then the 05 does with the 07,08 or 09 cars
Unless your getting either car really cheap(under 100$) i would look for something newer