Halo Reach is better than Halo 4 in every way. Halo 4 isn't really a great multiplayer game at all.Halo Reach felt more pro and was better all around. The commendations in H4 are **** to. Completely worthless. So easy to get.
To me Halo 4 feels a lot more like previous games. It has more of the floaty powerful feeling than Reach did. Reach felt totally different than any of them. As to which one I like better: I'm not entirely sure yet, but as of now I'm leaning towards Halo 4. The only thing I don't like about it is the new lobby interface. I feel like I'm looking at a bunch of trading cards. xD