Oh you guys are brutal.
Hey, "A_Little_Off_Route" and other newer trad climber, here are some things learned from my experiences.(I started climbing in 1990 and guided and instructed in AZ and CA in the mid '90's.)
1. Whichever system you get dialed into, stay with it so that you have a system and a habit.
Why?
If you’re in a finger crack and pumped, whatis the most natural gear grab location off your harness loops, more in front, the side, the rear? Sometimes there is no time or no state of mind to think about the small cams are on your rack. If you have a fist/foot crack you have more purchase on the rock and most likely would be less desperate to get a larger cam off your gear loops (harness(or chest for a longer route with a 70m rope)).
2. The other thing to think about is the type of climbing… more than vertical, vertical, less than vertical, slab, small edges, bigger ledges.
Why?
If you have a bunch longer slings, quick draws, cams, nuts (make that the passive cam device kind), it’s possible to get stuff caught in a crack, under a chicken head, under a foot, knee, etc, and literally trap yourself from making the next move. So, you might want to have the longer stuff in the rear gear loops.
3. Also consider how much gear you have around your front belay carabiner, belay device, etc., the less crap the better.
Why?
People have unclipped themselves from their anchor, as well as clipped a rappel device into something other than a harness. (I’ve seen both cases while climbing in popular areas in AZ.) So, again longer more complicated pieces in the rear to keep the front clear.
I’m sure you get the picture by now.