As stav says, neither one is better than the other, depends on the shooting you’re doing. For me personally, of all my rifles, .17hmr gets the least use. As for .22rf for fox, it’s well capable if you know what you’re doing. I have my .22 rimfires conditioned for all legal quarry and also fac air for that matter. Not that I’m saying fac air is the tool for the job though, but some of the higher powered ones would no doubt be capable.