-Steel roundwounds for my fretted basses. The best I've tried are DR Hi-Beams but they're very hard to find where I live and it's expensive to order them through the Net. The best ones I can find here are LaBella Hard Rockin' Steels. I also like them.
-Flatwounds for my fretless. Well, frankly I don't know so much about flatwounds. When I got my fretless I HAD to order a set through juststrings.com (flatwounds are impossible to find here) and I chose Rotosounds. I like them, but those are the only flats I've tried, so I don't know about others.
About gauges, I prefer 045-130 sets, but 128s are easier to find here.