I don't think there is a durability difference. As far as the lipos on the losi car There are plenty of lipos that fit, and very few that don't for the most part any roar legel lipo that doesn't have the "bumps" on the bottom will fit, like the losi pack the smc pack the checkpoint pack and quite a few others. I have checkpoint 5400's in my losi's.
Durability wise, i'm not the best driver and i tend to hit things often
i can show you some pictures hahah. I haven't had to replace much other than arms and c hubs which you'd have to replace on just about any touring car that you hit things often with. I hit a track spike at top speed (3.5 brushless on a big gas track) and the car drove away after the corner marshal had to use two hands and put his back into it to get it off the spike.
I've seen the tc5 take a couple of pretty good whacks too.
I'd say choose based on what the drivers in your area run. If you have lots of local support for one more so than the other go w/ that one. I went w/ the losi because there are a bazillion guys running them at the tracks i race.