There are plenty of opinions and this has been discussed to death in the forums. A quick search would have yielded lengthy discussions.
The question is, is the difference worth the $100 to YOU? You get the black finish, 2.8" versus 2.6" screen and 8GB of storage built in. With the N95-3 you get removable memory which means you can upgrade to 16GB, you can plug the mem card into an adapter in your PC for great data transfer speeds. With the N95-4 it's USB only and the transfer speeds are really slow. If you want to update your music on the phone a lot then this can be frustrating.
The question is, is the difference worth the $100 to YOU? You get the black finish, 2.8" versus 2.6" screen and 8GB of storage built in. With the N95-3 you get removable memory which means you can upgrade to 16GB, you can plug the mem card into an adapter in your PC for great data transfer speeds. With the N95-4 it's USB only and the transfer speeds are really slow. If you want to update your music on the phone a lot then this can be frustrating.