The best balance of functionality and carry-ability is, in my opinion, the original Leatherman Pocket Survival Tool. I think the current model that’s closest to the original PST would be the Bond model. My original PST stays around the house, on light duty, as I consider it somewhat collectible nowadays.
I have an original Wave that has been down the trail. I broke one of the screwdrivers (my fault) and the pliers were cockeyed from extreme use. It was past the 25 year warranty but Leatherman still fixed it for free anyway. They even installed a new blade as the old one had been resharpened so many times a great deal of steel was missing. The only problem with that was the new blade wasn’t sharpened correctly, but I easily took care of that myself. No complaints!
The Super Tool 300 is the most capable, this thing is an absolute unit. I like to keep it in a pack, as I feel it’s too heavy for the belt or pocket.