Orion 3800 and Trackpower dont fit....So there's no point comparing.
The only ones that fit are Yeah/Team C/Orion 3200/3400 and Harris 3200/3700.
But...most tracks will only allow ROAR approved packs (and rightly so) So we run the Harris 3200's which we've found to be perfect. I don't even bother looking at anything else.