I have two atlas and three harris bipods. The harris is faster to deploy since you can just flip the legs down without pushing any little buttons. That won't matter to you unless you hunt with it or shoot some of the super time limited matches where you start standing and are forced to start with the bipod folded. The Atlas seems to grip the ground a little better, less skidding. If you'll be shooting off a mat that will allow you hook the legs so you can load the bipod, then that advantage is irrelevant.

I'd shoot any match with either and not think twice about it. The Atlas looks cool, and it's what all the cool kids use. That, and some very slight perceived benefit were enought to pry the $600 out of my wallet.