I do not target sunfish but when I catch one it is usually on 12 pound test line while fishing for other species.

6 lb because that's my typical line for "I don't know what I'm going to catch today." Easy to work with, sunnies will bite it, and strong enough for the occasional bass or catfish.

I use 4 lb mono Vicious Hi Viz panfish line and order it direct from the factory on 1/4 lb spools.
I landed a 10 lb 6 oz largemouth on that very line using a live cricket on a size 10 wire cricket hook one late night during the spawn a few years ago. My daughter landed a buffalo on same size line one night that was either 18 or 21 lbs - can't remember which it was. Hit a crappie jig. It's cheap enough that it doesn't bother me one bit to scrap all the line on the reel and fill up with fresh. It has the least memory and is the best behaved line for a spinning reel of any mono I've ever used and I've tried most all of them. That buffalo did a number on that spool full do to all the twisting from her cranking while drag was letting line out and had to be replace that spool full the same night!

here's the bass pic - can't find the daughter's buffalo

30-50# pound braid I don't fish for them intentionally