I use a TB-01 for rally racing, and it's very good, albeit perhaps a little outdated. If Tamiya would release a real rally version of the TB-02, it could be a great rally car. The TB-02 Impreza is just an on road car with a rally body.
As for the TT-01, I couldn't recommend it. I'm not really qualified to comment, as I have never driven one, but it is clearly aimed at the absolute beginner, lacking the most basic things like oil dampers or adjustable toe and camber.
If you are looking for an affordable rally car, I recommend the TB-01 or the Kyosho PureTen Alpha 3.