The 110 and the Endura are both classics. 2 of the best selling knives ever.
What the choice really comes down to is your prefered method of carry. I would favor the Endura since it's slim and has a pocket clip. Despite Being 5" closed, the knife dissappears in a pocket.
If you prefer sheath carry, obviously the 110 would be a natural choice.
If you're indifferent to how you carry the knife, the decision is a bit of a toss-up. The FRN scales of the Endura, while durable, have a feel that many people consider "cheap". The Brass/wood of a 110 will feel much more substantial and solid. Think of it as comparing a heavy old revolver to a Glock. Beyond that, the Endura gets the nod for blade steel. The 420HC of the Buck isn't junk, but the VG-10 of the Endura is vastly superior.