They range from full vertical on target stocks, to non-existent on guns like the Beeman C1 and Air Venturi Bronco. Then there are the thumbhole stocks, which can also have varying degrees of angle. I've never been comfortable with thumbhole stocks. I guess it's just me.
My personal preference is for a vertical pistol grip, with a place for my thumb somewhere close to being in line with the bore. The Tau 200 stock is just about the most comfortable thing I've ever shot when it comes to trigger hand position. The Diana 66, with all its funky angularity, is a close second when it comes to trigger hand placement. The classic FWB 300S is a close third. Here's the thing about 10M target guns: when properly balanced, the trigger hand has no part in supporting the rifle, and has only one job, to pull the trigger. On a sporter or hunting rifle, the trigger hand helps to carry some of the rifle's weight, so a curved grip takes some of the load. A classic palm-swell grip like the FWB 124D will distribute that load a little more comfortably. I was always frustrated by the grip on the older Slavia springers. The curve was nice, but the reach from grip to trigger was always a bit too long. The full-straight, no-pistol-grip-at-all stock like the C1 (and Bronco) is very quick to shoulder and shoot, but it sacrifices something in terms of making the trigger hand do more work. Well suited to a point-and-shoot gun like an upland bird shotgun, but not well suited to a precision needle-threader.
So, what do I like? Vertical grip on a target stock. But I don't hunt anymore, and I don't carry a gun thru the woods.
What are your thoughts?