Just curious if anyone has any thoughts on which way to orient the ATC when rapelling.

If i were to try to figure it out on my own, i would guess that if you're a bit nervous about losing control, you should use high friction mode. (In addition to a prussik/kliemheist or fireman's belay, of course)

I'm 190lbs w/o gear and I prefer the low friction side on less than vertical raps or else it feels too "grabby" and not smooth for me. More weight and/or steeper terrain and the high friction side is appreciated.

Try different combos until you find one that you're comfortable with.

You can do either one it makes little difference but rope thickness and condition should be your main concern.

I usually attach the ATC to a sling or PAS and use it on low friction mode. By extending the ATC away from my body it is much easier for me to control the friction speed. I rarely use a rope thinner then 9.8 and the low friction side keeps it running smooth.

Thanks everyone!