I got them because I think they look better. I didn't even compare prices. I don't like the gasket on the Bushwackers. They are thicker and have some sort of foam core, so apparently trimming takes more work than Bushwackers.
I trimmed the van fenders (lower 8" near doors) before mounting, in case I needed more tire clearance (265/70R17). Turns out I didn't need more clearance, so I haven't trimmed the ATS fenders yet. I plan on it, just for tire chain clearance, but it's low on the priority list. With the M55 tires, I haven't needed to chain up all 4 corners yet (or even the rears for that matter).
Biggest downside for me was they wouldn't sell only the fronts. But, that's not a concern for most folks.