With Jazz Basses, I'd go maple all the way. I have experienced many a J, and I've always found that when they've got maple boards, they are more comfortable to play, look cooler, and I've
sometimes noticed a very slight subtle tonal differenece. However, it's so insignificant that it wouldn't really matter to anyone but a tone-nut who probably would be buying some 10K boutique bass anyway.
With a Ric, I'm fine with rosewood (don't really have a choice do I?

). A Ric actually carries a brighter tone than a jazz, and a more, clanky sound, and has rosewood.
When it comes down to it, it's all about hardware (bridges especially), strings, pickups and the hands. The woods only do a little bit of the job. Unless you play upright, in which case you're on the wrong half of the forum my friend.