Easy, get the 415... The original car seems more suited to the rug, as it has a 3mm chassis, and you can stiffen it up with the chassis posts. Makes a bloody stiff platform.
And you really shouldn't need to get to the diffs that often... Tamiya diffs are top notch, and stay that way for a long time (just get some ceramic 3mm diff balls, and your all set).
I've owned numerous 415's now, and the quality of the kit is always top notch... not something you can say about a TC3...
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