For me, it's Regenerate Guitar Works, then G&L and Music Man. I have a couple great Warmoths and a Rick Turner, and I've owned plenty of other brands, but the ones that I gravitate to are RGW and G&L, followed closely by EBMM.
I actually prefer 19mm, but there's something I just really like about the G&L and EBMM 5-strings (17mm and 17.5mm, respectively) that makes me overlook the spacing. Part of it is the sound(s), part is the feel of their necks, part is the overall vibe and history of the brands, etc.
I've had a good relationship with Rod at RGW for a long time, so I'm very happy to play his basses and represent Regenerate Guitar Works. Part of the draw for me is the personal interaction, but Rod's basses are easily on par with Sadowsky, Lull, and Lakland, etc.