I just want to know which is the heavyweight champion thats stock RTR.
Of the three, that title really belongs to the SC10 4x4.
That said, if it were me, I'd opt for the Losi. I'm an Associated guy, but I really,
really don't like belt drive systems.
As it were, I opted for the Associated Prolite 4x4, been quite happy with it. Upgraded immediately to SC10 4x4 shocks (stock Prolite shocks are crap), put sway bars on it and ditched the stock tires for Proline Calibers. Drove it that way for a bit, then decided to stick 1/8 scale electronics in it.
Rear hub carriers have been a weak link, got aluminum ones coming. I was going through front CVAs for awhile, but that was my fault, as I had mounted the front shocks too far inboard on the arms, and the axles were what was limiting downward suspension travel. Moved the shocks out to the next hole, no more busted axles. I have broken the rear body mount once and trashed the steering servo, have had to replace some of the wheel bearings. Other than that, it's been a solid truck. Considering that I'm punishing this 1/10 chassis with a 2150 KV 1/8 scale motor on 3S and 4S exclusively, I have to give it pretty high marks for hanging in there.