Yup, the TA05 for sure.. maintenance-wise, you don't have to take off the sway bar holder (and the bumper if you want the front) before opening up diff cases..
Want to change a spur? Pop 5 screws to get to the gear, unlike popping the rear diff box/sway holder and sliding out the shaft while balancing shims and a crown gear on the end. Plus, as noted, you have the choice of any spur/pinion you want.
Hit a wall hard? Belts can absorb the stretch, no biggie.. but those bevel crown gears I've gone through tons, especially with the one-way.. I've abused my TA05 in tons of races, one-way or not, but I've only bent a suspension shaft.. can't say that for my TB02..
Finally, the 05 has a reinforced diff option to its stock diffs (just like the discontinued Evo III diffs), at a decent price.. the 02 now has the stock ones (went through a whack of those too) and the ultra-spensive delrin ones.. only if they brought back the Evo III part, that'd be smart..
The TA05 will continue to be focused on by Tamiya to TRF form, whereas the TB-02's already had its TRF equivalent.. the Evo III. In full working order, the TB-02 was responsive, smooth with stock motors, and a pleasure to drive, but the 05 is simply a better car, and easier to work on and to keep in working order.
Now, question is, will the TB-03 be a tub version of the Evo V?
-=≡ Tamiya TA05 · TRF415MSX · F103R · M-03R · M-04 · M-05 ≡=-
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