If I was getting one as a snake gun to carry hip-holstered on a ranch or something, I'd probably opt for the longer barrel (I think it's 4-inch).
As I said, shooting small shot through this the spread is W-I-D-E. The rifled barrel seems to exacerbate this somewhat. By wide, I'm talking about probably a 2-3 foot spread at less than 10 feet with small shot and the short barrel.
You could sure mess up a snake like that, so it would work well from a few to several paces away, but you'd have to be pretty careful if you'd shooting at something a foot from your leg to keep from blowing your toes off.
I know there's a lot of talk about this gun, most of it not too complimentary as a home defense weapon, but I really like it. I think it would be an awesome snake gun, and as an "oh $#!+ weapon to keep in the nightstand, I think I could tear someone a new one with it pretty easily...
and as mentioned, it's fun to shoot.