Re: Which is a better fretboard?
Technically, maple is more 'desired' since its not as common and rosewood is seen as a cheaper wood by some people. In practice though, I very much like rosewood fingerboards and its a purely preference thing. If you like a very snappy attack, go maple. If you want a more soft, singing feel to your sound, go for rosewood.
As for the plats and so on, the AANJ does what it says on the tin, its better for upper fret access. The block heel style guitars are older and again, more desire for that reason, but in practicality its weighing up two things again. The block heels are REPORTED to have more tone and sustain than an AANJ of similar quality, but the AANJs are much easier to play for obvious reasons.
I should note however, that the improvements of the block heel tonally are just as dependent on the construction of that particular guitar as they are on the design. While Ibanez from that period are great, the design is no guarantee of tone. There are awesomely well built AANJ necks that sustain forever, and there are plenty of block heel guitars made by lots of manufactueres, that sustain like a quick shag and are about as satisfying.
However either guitar from those years should be fantastic for its own reasons. I would say weigh up which fretboard sound apeals to you most, then decide whether you REALLY REALLY want that block heel tone or whether you want the upper fret access, bearing in mind that the neck joints might actually sound exactly the same due to different builds.