More than anything, these sort of queries only tell you about a poster's favorite pistol or which task holds the highest priority for them. Not what the "best" pistol is. I don't know what country you are posting from, but in the USA you might as well have a pistol for each task (allowing for priority and budget).
For example, I'm not a hunter, so I can conveniently ignore that part. If hunting were my lifestyle, I might choose some ridiculous rifle caliber or supermagnum single shot, carry/defense be damned. Similarly, a dedicated rimfire hunting pistol is also suboptimal for carry/defense or large game.
At this particular moment in time, I'm more concerned with ease of carry. If I should happen to prefer a longarm for defense, I can conveniently ignore that requirement as well.
Since I don't hunt and could probably get by with a longarm for defense, I'd probably go with a Ruger LCP or maybe a plastic subcompact single stack 9mm. There, are you happy now?
Thing is, there's not really much overlap between a carry pistol and a hunting pistol. You could probably try to choose something modular like a Sig P320, a TC Whatever, Witness/Tanfoglio Whatever, or a Dan Wesson revolver, but there is going to be a massive compromise somewhere. And then caliber conversion kits tend to be so expensive you might as well just buy a separate dedicated pistol anyways.
And then what could I do for competition use? Competition pistols are pretty much mutually exclusive.
My .45 Blackhawk convertible is my hunting handgun so.....
Holy crap, a ghost ring on a pistol!
Seriously though, that's fairly intriguing. I've tried a rifle style diopter sight on an air pistol. I've found that a rifle style tiny aperture is either limiting in technique or speed but impressive in accuracy (in daylight, anyways). I've been meaning to drill out a spare sight blade to more of a ghost ring style but I never got around to it.