So, I was thinking about this thread this weekend as I was putting new roofing on the shed that is somewhat attached to the back of the barn without falling off or through the roof.
Couple of loose thoughts on what works for me. YMMV.
GRIP MATTERS - I have XL sized hands. Cutting the rolls of roofing material was hard. I had to apply a lot of pressure. Then, later, I needed to make some more precise cuts using a variety of different holds. I hate grips that lock me in to a single position and prefer a larger handle for tasks that require a lot of cutting pressure. I was using a Buck 110 and I find it to be a real favorite of mine for extended cutting. I also really like a modified Opinel #10 for folders. For fixed blades, the Mora Companion is very hard to beat. I find the Opinel #9 and Case Large Sodbuster to be nice town knives. Big enough for food. Small enough for easy carry. But the handles are big enough for really hard cutting. Not for me anyway.
USED WITH IMPUNITY - The blade on my Opinels and Bucks look like crap. They're scratched to heck and back. Roof material does that. So does cutting flashing. They also develop blade loss through repeated sharpening. They're just tools to be used and used up. Buck will replace blades for very little money. Opinels cost very little new. Sure... I have some lookers that I don't use in hard use conditions. But a user knife for me is a user.
REAR POCKET CARRY FOLDER - I like fixed blades in the hand. Who doesn't. I don't like carrying a fixed blade. I just can't stand things on my belt. I sew a seam up the back of my right rear pocket and put my big folder there. Much easier to move around. No need to take the knife on and off my belt when running to the store for more roofing tar.
LOCKING FOLDER - Opinions vary on this. Yes, I know how to handle a slip joint. Yes, I know better than to push a locking mechanism hard. But when I'm making a plunge cut, whether it be a piece of roofing or a frozen hamburger patties, I want a lock.
BLADE PLAY - I hate blade play. Just hate it. No knife I've used is more resistant to blade play than the Opinel. IMO, the toughest joint I've used is the Opinel. The Buck 110 is plenty rugged. But they can loosen up over time, both vertically and horizontally. Buck has a great warranty and great customer service but any lock back can develop lock rock.
DIRT AND SAND - I'm going up to open my uncle's cabin this weekend. I'll be spending a lot of time on a sandy beach. I'll be carrying the Opinel #10. It's the only folding knife I've owned that I can drop in the sand and knock it off on my boot heel and pick up where I left off. Sure, the lock ring will be gritty but it will be as safe as ever. I like my 110 plenty but it doesn't like sand.
Opinel #10. Buck 110. Those are my hard use traditional folders of choice.