Stew Mac wire. I use several of their medium wires. I find their large wires a pain in the butt to bend.
How about StewMac's fret bender, Bill? That seems to be a good tool to have for bigger frets.
I prefer vintage fret wire, thin with a very narrow contact strip with the strings. Provides more accurate intonation and cleaner tone in my opinion...think about a 1/4 inch wide flat fret and its implications.
Fret wire got wider and flatter and board radius bigger as guitar players started bending notes. Unfortunately basses followed suit.
Since you didn't ask: Fretboard Radius:smaller radius boards are more ergonomic and also intonate better, especially for chords, that's why the older the instrument the smaller the radius generally. But we're all pretty much used to whatever decent instrument radius we started out with. Dual radius guitar boards are small radius at the top so you can play in tune chords and flatter at the bottom for soloing. Happily not a concern for me.
It's more difficult to shape and fret a small radius board and another reason cheaper guitars have flatter boards.
But whatever floats yer boat. Or whips yer booty