I've liked pau ferro boards, and rosewood boards, on fretless basses. Had a pau ferro board on a Jaco sig fretless I owned briefly.
But i really love the tone and action I get with the ebony board on my Fender Tony Franklin fretless P. Miles of mwah, and a fat sound - a highly recommended 4-string fretless (and I just came across one on the Guitar Center used site - for a very good price; that's where I found mine, and it practically brand new - used for a couple weeks and returned by someone)
For (much) tighter string spacing, on a five-string, I'd recommend the Ibanez Gary Willis sig. It's super light, too. Haven't tried a bunch of them, though, so I don't have a lot of thoughts on comparison.
I have played the Lakland 5502 fretted, and that is a killer bass - fit, finish, playability, tone, everything. Tight (not floppy) B string.
Same goes for the Stingray fretted, which was my main bass for 20 years before I switched to Laklands. Can't really go wrong with Musicman.
Once you make the switch, give yourself time - plenty of time - to adjust to the realities of fretless playing. Takes a while to get the intonation/feel right. Won't happen overnight.
Also, I'd vote for unlined - but that's a whole other topic (and subject of multiple threads and virtual fistfights)