Hi fegbri and welcome!
You're asking a tough question there....If you've looked at pictures of those cars I'm sure you've realized they are nearly identical, so once again I think it boils down to parts availability or personal preference. I own a TB-02 and love it, beat the snot out of it on a constant basis and it just keeps on going, but hop-up options are severely limited and a little pricey. Gearing is limited too unless you're handy with a dremel
The TC4 is still relatively new but there's already a growing list of hop ups available for it and as with most Associated cars soon enough you'll be able to build one completely out of aftermarket parts.
Guess it all depends on whose parts your LHS carries-I went with Tamiya because I am a rabid drooling diehard fan of theirs, and their bodies are second to none. Can't get parts for it at my LHS though-They do not carry a single Tamiya piece.
Good luck on your decision!