Don't have a B4 so...
The TLR is great but I can't get it as dialed as easily, but I haven't totally given up on it yet. It's great but quirky, probably just me. It is a very clean design though, easy to work on, simple but effective adjustments and parts are more common if you need them. Been a long time Losi guy.
The 210 is a huge advancement in design but I simply don't have enough wheel time with it yet to say how much I like it or why. And frankly, why couldn't they settle on one design? why 4 options? so we have to build and test each one on every track under every condition? Frickin beautiful though, Durangos best effort so far. It should be the best car but....
The RB5 comes out of the box and on the track almost like I gave birth to it.
I think I need another one.