Assuming your accuracy is virtually the same for either gun, I'd say it's whatever you want to use. I've personally never bear hunted, but I do hear that the hair can absorb a lot of blood so if it runs off a bigger hole might be better, but I'll venture a guess one won't go far with either if the hit is on.
Good luck on your hunt. Black bear is something I've had on the back burner all my life and I don't know if I'll ever get to it. We have huntable populations of them in Minnesota "up north" and even the occasional one down by me (no season on them by me).
Had a good sized one tear my bird feeder down 20 feet from the house while I hollered out the window at it. I had just shot a coon off the feeder and went out to get it, came back in and put the gun in the rack, looked out the window and he was there! It was just getting dark...I have no idea where he was 2 minutes before when I was out there. He completely ignored me and ate all the sunflower seeds, then waddled away. My feeder was about 4 feet long and the bottom of it was six feet off the ground. On his hind legs, he was looking directly into the feeder, so this guy would have squared at 6 1/2' plus, I assume. I think that's a pretty good size black, from what I've heard.