I found if it's all the same caliber, the bigger guns will be easier to shoot. I carry a smaller gun during warmer weather for concealment. If I dress appropriately, the bigger gun comes along because I'm far more comfortable and confident in my draw and shooting abilities with it.Honestly I thought I would shoot the single stacks so much better. But the regular double stack full size grip just felt so much better and much more comfortable to shoot.
It's hard to look past the Shield with the rebate right now. Maybe more training with it would help. I had one but traded it because it felt as big as my 2.0c but thinner. At that point, I'd might as well carry the double stack.