Tough one. So many ways to get all the bases covered. I ll keep my choices to ones that I already have and have experience with then I'll do a dream list of two that I THINK would suit me.
HW95 in 177 (12 ft lb) and FX Royale 400 in 22.
Dream list
HW95 in 177 (12 ft lb) and bullpup design (22 cal) w/3 position power wheel like FX Royale series guns have and a forward cocking lever. Not too far off from the practical list but that's what I would like.
As of today, I'd go with my Impact MkII 0.25 and Edgun R5M.
The Edgun for the rifle that I know will work perfectly every time I pick it up and the Impact for something to tinker with and tweak when shelter-in-place boredom strikes.
Ask me again in a month or three and my answer will likely be something different.
Wait! Are we taking "end of the world" airguns? Just kidding, that's a whole other discussion.
I'd have to have my Diana 36 in .177. It has the ugliest bore, BUT is an absolute laser. When you slug a pellet through it, the pellet looks like it was pushed through an old rusty cast iron pipe.
Then I might have to try a Redwolf in .22. In red. Does anyone in the Portland area own one I could try?