Personally, I think the big Spear point is the least useful blade for me, however it does have merit as a good blade for a young boy (which is probably why it's the main blade on a boyscout knife. You're a little less likely to stab yourself badly with a wide spear point. And it works pretty good for spreading peanut butter or mustard on on your bread.
I find the best all around blade to be a big Clip/Bowie style blade, and it's my favorite blade for general use. There is not much I can't do with a Clip Blade.
I like the sheep's foot blade for a secondary blade or a pen blade, and the wharncliffe would be a good second blade, also.
I used to rely on the spey blade a lot years ago, for cutting calves and hogs, which is where it shines. I always felt it was the best choice, for that chore, plus the rounded tip was safer to be around if the animal moved or kicked loose. IMHO a stockman can't be a stockman without a spey blade.
I always preferred the sheepsfoot for doing things like stripping Romex wire sheathing from electrical wiring, or maybe cutting leather on a board, etc.
Which makes the 4 inch stockman probably one of the best knife patterns ever made for EDC if you are a cowboy, farmer, etc. I also like the Great Eastern Wrangler pretty good, because I like the leather punch blade, but I would rather have given up the sprey for a sheepsfoot on that knife, as I don't cut calves much anymore, preferring to band them instead.
If I can only carry one knife with one blade make mine about a 4 inch long clip blade.