Honestly, I thought both maps were great, but maybe you could take the most liked parts of them both and combine them in the new one.
One of the things liked about aegis (At least for me anyway, and I lived right off it) was the king's road. Having a large, well maintained high way connecting the realms was quite frankly awesome. One of the major complaints though were that you could walk from one end of it, to the other, and potentially through all 4 racial kingdoms, in 10 minutes.
Asulon had a much larger travel time. But then new players who never knew aegis came along and went 'omg, wtf why i walk 20 min to go 1/4 way across map? this sux' and so rapid travel came into play, with horses and ships.
That's just one aspect though, I could write 10 pages about the maps. I would suggest a kings-like-road in 3.0 which was well maintained, populated at points, and ran to all the kingdoms, maybe put the travel time somewhere halfway between aegis and asulon.
Also, keep the neat hidden stuff asulon had, like the dungeons and puzzles and things. I had the time of my life exploring in asulon, like that old crypt lookin thing with the 'ye olde mine' 1 way exit that was northeast of the cloud temple, or that massive tree with the awesome puzzle that was over near menorcress. That blew my f'kin mind. Whomever made that needs a 'Master of Minecraft' title or something... anyway, before I ramble more on all the neat things i've seen on both maps i'd love to see on the third, i'll be wandering off.
Good luck with what you decide to do. I'll certainly poke in once or thrice to wander a bit.