Since this has been bumped, for aid walls, definitely ladders. And another big vote for Fish ladders, whether 3/4 inch webbing or pay the couple bucks extra for more cush from 1 inch. Like some poster upthread, I have one ladder and one matching Fish light aider on each biner. Four is definitely a bit more of a cluster but less strenuous overall. For a mixed wall (Nose), three aiders, one per biner. You can leave one behind when going free and still have two left in case that doesn't work out as planned... The aiders with lots of short steps are not good at all, if you are wearing approach shoes or boots, it is too much fiddling to get your foot in. The spacing of steps on the Fish aiders (which matches the ladders exactly - perfect!) is right. It makes you make bigger steps up thereby saving time every single placement. To me, the solid plastic spreader bar at the top seems essential. I have other Misty Mtn. gear and think it is fantastic (best big wall gear sling by far), but their ladder lacks the spreader bar, which is a great handle and helps get your foot in when top stepping.