Well, you could replace the Traxxas one 8 times but, the Tekno one is probably stronger.....so....I would go w/the Tekno one on the premise that do it once right and forget about it
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
Tekno makes great products for sure, however, for a 70 dollar difference and seeing the TRX ones are so cheap, my vote goes TRX. If the TRX ones don't work out, your only out 10 bucks. I would spend the extra cash saved elsewhere like sway bars and the like to improve handling.
I have never had an issue running the TRX 6mm axles on 6s either. I now have proline 23mm hubs with beadlock rims and 40 series dirt hawgs and haven't had an issue yet.
I voted traxxas due to the fact I think most should be running the RPM true tracks in the rear and you can't run the tekno's w/ the true tracks :) The tekno's up front would be fine, but why bother when you buy a set of the traxxas and they work just as well :)