:roll:
First off, I have driven both on a very technical course, and I own an AX10. Stock for stock, the Creeper is hands down the better vehicle. Yes, lots of after market support for the AX10, but in order to get to the level of the Creeper, you would need to spend quite a bit just to get it up to a stock Creeper capabilities.
Yes, the lockable front and rear diffs may not be as robust as some would like, but that's an awesome feature! Personally, if I wanted it only to be a crawler, I would lock both axles, but having that front diff open when I need it? Priceless.
My friend has an AX10, Rock Force, and Creeper, and after beating on them, we rated the Creeper the best out of the box. Next was the Rock Force, and finally the AX10.
With a few mods to the Rock Force, it exceeded the Creeper in almost every way, but to get the AX10 to the level of a slightly modded Rock Force, took time and money, when I could have began w/ either a Rock Force or Creeper. By slightly modded, I mean a new delrin bottom plate, Eritex narrow wheels, Kyosho dig, Kyosho High Speed gears, and HB Rovers (white). A modded AX10 (my current config), consist of MFM Black Widow chassis, w/ Associated shocks, Eritex wheels, HB Rovers (white), aluminum hubs and knuckles, new front and rear links (MFM delrin links are wimpy), TCS rear 4 link plate, custom made front 4 link plate, and finally chromoly lockers. Like what bigskycrawling said, I only really have the axle and center transmission left over from my AX10 kit. My buddy can regularly keep up with me on our course with the minimum mods he has done to his Rock Force, and a stock Creeper. I'll say it again, stock Creeper.
To each his own, but some of these comments are purely biased and does not provide ANY data to back up their claims. I for one have driven all 3 rather hard, and personally, I would pick the Rock Force over the other 2. That is, until the Losi Crawler comes out.