I've had maple, rosewood, ebony, pao ferro, bubinga, and wenge.
So far, ebony will always be first and wenge will always be last with rosewood/pao taking a close second. Everything else falls nicely in the middle.
For me, it really depends on the bass. I had a Am Jazz with a maple board I will always regret selling. It was "the bass". But I hate the maple board on my MM SR5. Hated the maple board on my Sadowsky 24-5, too. Then again, I've got maple on a Schecter that's fast becoming "the bass." Will see about that with new strings and pups.
As far as switching necks, I say go for it, especially on a 95/98. BUT...I'd have to think about it if it were a 65/68 combo. Would detract from the price too much.
dcr