Everything's a trade-off when it comes to these choices. In terms of traditional hollow body guitars, the big guns in traditional jazz boxes like the $12k Gibson L-5 CES have maple necks and bodies and ebony boards. Keep in mind, however, that changing any element of these recipes affects the tone and response of the guitar. The L-5 also has a spruce top, and has a larger body, and the PRS will have mahogany rims, so there are a few substantial differences between that and a PRS hollow body.
A maple neck will usually scoop the midrange a little; however, the ebony board will sometimes add the midrange back in a nice way. A mahogany neck will often give a warmer sound, as will a rosewood fingerboard.
For me, the neck and fingerboard make a really important difference. What I'd say is
be careful what you wish for!
There are times when what works on one guitar doesn't translate to a different guitar that you might buy for a different purpose. As an example, I was crazy about my Artist V with its mahogany neck and ebony board. What a great guitar! So I got myself an SC58 with the same combination. When I ordered that SC58, I also had a Stripped 58, that I loved. I figured the two would compliment each other, and they certainly would have, but by the time the SC58 rolled in, I had sold the Stripped 58. The SC58 sounded great, but I missed the traditional tone I had gotten with the Stripper, and I wound up selling the SC58 to get an SC245 with a rosewood board.
If you play a Hollowbody II in a store, and your thought is, "I love it, but I wish it had this or that different quality," that's one thing. If your thought is, "This is perfect," then don't fix what ain't broken!
The HBII isn't a big ol' jazz box, which is one of the things that makes it great, but I can see why PRS chose a mahogany neck, RW board and 'hog rims to warm it up a little.
In terms of care, rosewood and ebony are the same. Clean the board with lemon oil when it needs it. and then wipe off. I don't recommend oils (lemon oil is just scented naphtha), the woods are naturally oily, and you're not really adding a thing that the wood needs, and in most cases, are detracting from its longevity by softening it.