I like the Caldwell Rock Jr.. Stability of a bag, with easy adjustment. Pretty inexpensive, too.
I had used bags previously, till the muzzle blast from one of my .41Mags destroyed the front bag (attempting to stretch 'er out a bit) & decided to try something a bit different. I don't use a rear bag, as I can never seem to get it "set" right & I only use a rest for zero & warm-up purposes. I'm no kinda wannabe benchrest shooter or any kinda super-duper marksman & prefer to do the majority of my shooting offhand or from "field" positions.