I got the 1-up USA and really like it (had a Yakima Bighorn before)… you can buy extensions for each additional bike after the first one and kinda mount them stacked to each other as needed. They fold up quite nicely when not in use and can be stored in their original shipping boxes (super burly 3-ply).
It mounts very securely in the receiver with an anti-theft key that actually tightens a ball against the inside sleeve of the receiver so there’s no wobble, unlike most that just have a pin to keep it from coming out. The way the trays/arms hold the bike by the wheels, it touches nothing but the tires so there’s none of the usual frame rub, etc, and the bikes don’t swing into each other like they do on the ‘hanging’ style.
The biggest thing I like about it is the trays will take my kids’ bikes very easily, whereas the Bighorn (hanging style you mention) was a huge PITA to thread through the little mutant triangles on my kids’ frames (especially since they’re heavy as fuck, too). I’d imagine a lot of MTBs would share the same trouble. If all I had were adult-sized roadies (perhaps that’s the case for you) then the Bighorn would have been fine.