Unlike a Nitro, If an Electric Car doesnt run when you buy it, we can Help Diagnose the problem on line and if it is Ultra bad, then all you need to do is buy a cheap component to get it to go, unlike a Nitro where the Cheapest component could be a New Engine.... not good...
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The TC4 is a Premium Level race Bred Shaft Drive.. It is one of the Best Shaft Drive platforms for racing.
Some say the TC3 Handles better, I have only ever driven the TC4 before and found it really nice to slide..

The TT-01 is the Economy pack.. its Nice to drive and Does the job but needs a few upgrades to improve its slide-ability like an Alloy propshaft and Ball Bearings..

So If I were to put it like this
The TC4 would be the BMW, Race Bred and Powerfull and a Delight to drive but expensive to repair
The TT-01 would be the S13 Silvia : Cheap, a Blast to slide but needs upgrades to unleash the Demon inside...