I have all of them, so I will give you my opinion, and you can do what you want with it
Pen Bay versus Hudson Bay. They are the same head (size, shape and weight). The 24" handle gives you an amazing amount more power over the 18" Pen Bay or even the 19" SFA. So, as far as what the axe CAN do, the bigger one is better.
However, you have to pair that with "will I have it with me?" If the axe is too big for you to take where you are going and stays home, than it is pretty useless.
One nice thing about the Pen Bay is that it will fit
inside a normal day pack. That can be a big plus in certain situations. And don't get me wrong, it is plenty axe to do a lot of work with. But, the bigger one makes some things easier.
Now, S&N versus GB...... You are comparing apples to oranges. They feel completely different. The GB comes screaming sharp, and setup with good forward edge cutting geometry. But, that is it. It ends there. But, obviously that is enough to make them extremely popular with folks, probably because they have not used a properly setup axe before. The rest of the GB head shape is not that great for making it a good "all around axe." I know people are going to claim they do this and that with it, but it is very poor for splitting and batoning. Yet, you still can do it. Because of the lighter, and more nimble head, the GB is also more suited towards lighter "limbing" duties.
But, for me, I want want my all around axe to chop, split, cut and limb, in that order. I feel that a properly setup S&N does that better than the GB. I mean, I have dozens of axes laying around here and I know which ones go into the woods with me, and which ones stay home.
I also feel that the wetterlings face the same head geometry drawbacks as the GB. They will also require setting up the cutting edge. GB is the only axe I know of that takes care of that for you.
Now, 95% of getting the best performance out of an axe is to setup the forward cutting edge. You can do that yourself to just about any axe, and you might want to play with doing it to cheapies and an experiment.
Also, realize my priorities might be different than yours, and could lead you to the GB. That is just my take on all of them.
B