10s for electric, 12s for acoustic.
Over the years, for electric I've used 09s, 10s, 11s and then eventually back to 10s.
Currently, all my electric guitars have 10s…Curt Mangan strings are my go-to brand.
I find the 09s just too soft for my playing, but that's what I played for many years in my younger days, and then once I switched to 10s, I never went back to 09s.
The 11s have a nice big sound, with a bold fundamental note...but that's also what I don't always like about them, as the overtones/harmonics are not as rich/balanced as I get with 10s. The 11s work great for some things where you want the big, clean fundamental notes, but I find the 10s to be the "best" overall gauge for a wider variety of sounds.
That said, I miss the 11s for some stuff...so I've been thinking about putting 11s on at least a couple of my guitars just to have the additional option.
On acoustics I've tried lighter gauges, mainly 'cuz I'm not a regular acoustic player, and the lighter gauges were a bit easier...but they sounded like shit. Even tried electric strings on acoustic…which give a brighter/jangly sound.
I find that 12s are the best choice for me on acoustic. A little extra work than my electric guitars, but the full, rich sound makes it worthwhile.
I have a couple of odd-gauge, 11.5 string sets (Ernie Ball, I think) which I got just to try…but I’ve never put them on.