If you're gonna strictly be crawling, the Axial RTR is a bit lacking. It has an open front diff and plastic linkages that are SUPER flexy. The electronics are marginal at best. The RTR Goliath is a bit better due to the fact that it comes with locked front/rear diffs, METAL linkages all around and decent Hitec electronics including an HS-645-MG steering servo. Admittedly, not the best, but a good starter servo and much better than the crud servo in the Axial. However, it too is a bit lacking in some areas. It will need the optional gearbox to be a truly dedicated crawler. The Goliath does use plastic gears in the axles, but they have updated the parts to better tolerances so the durability of the gears is MUCH better than in the past.

As far as RTRs go, there is no kit out there that is perfect due to the fact that certain corners are cut in order to keep the whole thing affordable.