I doubt you thoroughly test your knives. If it were the case you would have tested the knives you mentioned. The Buck vantage is made in the USA and their Bos heat treated 420HC easily beats "better" steels. Their version of S30V treated by Bos as well is even better. Opinel of any model would not last very long compared to a vantage. It's just not built as tough and Bucks vantage in 420HC holds a better edge. Thoroughly tested side by side working outside a lab test would show you that.
If you're going to spend $12.00 on a knife and want it to be tough and keep an edge you're better off getting a mora.
My #1, #2 and #3 most commonly carried knives are (in order): Opinel #9 Inox (12C27), Buck 500 (440C) and Buck 110 (420HC).
Big folders by
Pinnah, on Flickr
I can't tell any difference in the Opinel's 12C27 and Buck's 420HC. I can tell a very large difference between Buck's 420HC, Cases's 420HC (much softer) and Bucks 440C (toothier).
Opinel's 12C27 and Buck's 420HC are both hardened to 58Rc. Both handle fairly thin edges without rolling, both dent before they chip when abused, and both are a dream to sharpen. Steel to steel, I can't tell them apart.
In terms of blade performance, I find the flat/convex Opinel blade to be more versatile than Buck's (or anybody's) hollow grind. The flat grind is heads and shoulders better than the hollow grind for slicing. The Opinel also handles wood working much better, which noticeably less diving. Buck's hollow grind handles meat (which self separates) a tiny bit better, but I would much rather cut meat with the Opinel than work wood with the hollow grind. YMMV.
In terms of durability/functionality of the knife, particularly the joint, there are pros and cons with each design but short version is that the Opinel is much, much, much tougher than any lockback I've owned. The Opinel design appears to be impervious to developing any lateral or vertical play. The Opinel design won't foul when choked with sand or dirt. But, the Opinel will get finicky if used in wet environments and won't clean up from blood and fish guts as easily or as well. The Opinel also won't produce that soul satisfying "clack" like a nice lock back will.
I think the Buck Vantage is an excellent suggestion for the OP.