The stock front wheel bearings seemed pretty robust to me. I put them through the nastiest stuff you could do to them, with offset wheels and aftermarket a-arms, rocky terrain, 3 feet of gritty water and mud on a regular basis, and I think they were pretty much the only moving part aside from the engine components that I didn't wear out and have to replace. Literally, I broke or wore out the a-arm pivots, ball joints, several sets of tie rod ends, axle bearings 3 times, swingarm bearings twice, shock bushings front and rear, steering stem bearing and upper bushing, **** even the pivots on the levers and thumb throttle and the shifter were ravaged beyond use. Yet the stock front wheel bearings survived all this, only being greased one time when I took the spindles off to ream them out. Weird, huh?
The regular ball rollers are a little easier to maintain, I always hated dealing with the tapered ones on my truck because I just don't know how you're supposed to accurately tighten the spindles so they aren't loose or over tightened. It doesn't make a difference one way or the other with regular ball bearings as long as they are tight enough to stay on the spindles.