Daily drive Gnentoo, not sure if I could ever wholeheartedly recommend it since it's not really accessible for beginners...

If I need a VM I'd probably spin up an Arch or Alpine since they are relatively minimal & are not that difficult to set up once you're familiar with stuff (well Arch is one-command setup now). For servers... pretty much Debian always since that's what everyone supports

Stability-wise... I guess it depends on what type of "stability" I want? If I meant stability by having stable programming environments then it's not compatible with having new updates, Debian probably would be best for that. If I meant stability by the system not breaking too often, then most rolling release distros are probably fine? Arch/Gentoo have a lot more room for user error which is probably where most of the instability comes from, but otherwise they typically don't have too many issues I believe. Fedora is great but there's been some issue with RHEL going close-source, so I guess some ppl won't want to support that endeavor