D'Addario Pro Steels! The old strings were actually those as well, but I wanted a fresh set anyway. My Mustang and Bronco both have Chromes (flatwounds). The tone across strings/frets is super even, it's nice and boomy/mellow, and I like the sound I get with a pick.
But with this guitar, the pickup is hotter, and I like the grit/jangle that comes out of it with rounds, so I'm gonna stick with those. I did have to raise the action a good bit to get out of Buzzy McBuzztown when playing with a pick though lol. Feels like I should only play fast/upbeat/aggressive stuff!
I haven't taken it to a practice/gig yet, but plan to soon.