I like both of those powders, but IMR-4350 has long been a favorite of mine for 30-06. But I've also been finding RL22 to be a great powder for cartridges like the 30-06, 6mm, .243, .270 win, and the 7mm RM. Either way, IMR-4350 or IMR-4831 SC or standard are excellent performers for this cartridge.
My only suggestion if you go with either one of those, is that in my experience, they perform best at the upper end of the charge tables, at or near max.
GS