Yamaha BB2000. I own one now (actually two - my other 4-string is a BB2000 Fretless) and have tried a few others, but the first one I got was special - thick, jet-black ebony board, beautiful bloom to notes on the upper frets…but it had replacement Bartolini pickups, the G string seemed weak, and it weighed a TON. In retrospect, should have tried some other pickups.
G&L L-2000, ebony board, cobalt blue finish, 3-way coil switch. Great ergonomics, and the prettiest bass I'll ever see. Thought it was so nice, I bought it twice…and sold it twice…for all of it's virtues, I never could dial in the tone I sought - ultimately concluded that the ceramic magnets on the MFD pickups just don't have the tonal center and sweetness of good alnico's….but, of course, I could be insane. Still periodically in touch with the other owner, who has shown it the requisite love. Have recently learned that G&L now makes replacement L2K pickups with alnico magnets…hmmmm….Truly a great bass.
Xotic J-5 (or whatever they call them). Killer tones and construction - the least "active" sounding 3-band I've ever experienced, great passive control, and a neat feature where the two j-pickups could be conjoined to function as a single humbucker. Unfortunately, ergonomics were bad for me - I've learned, the hard way, that full-size offset-waist J bodies just don't work for me…the smaller J-shape of my Sadowsky 5-24 is tolerable, the body shapes of MM stingrays, Lakland 4-94/55-94 or later-issue G&L L2000 are way better.
Honorable mention - Pedulla Penta 5, defretted. So the the side markers were not ideal for fretless, and it did not have the super-slick glassy polyester fretboard finish - but what a glorious, organic woody tone, an incredible feel to the fretboard, and somehow, easier to play in tune…maybe because there was so much fat fundamental baked into the tone. But not at all down with the body shape…sold it when I got my Lakland 54-76 fretless, an old prototype 34" 5, one MM pickup (I have a Nordstrand in place).
Honorable mention - Stingray 5 HH, mahogany tone block, ebony board, recent alnico pickups. A little heavy, but great sounds and ergonomics that were just about ideal, except for the narrow string spacing. If I could have gotten it in 19mm spacing (I tried), I'd have been done.