I don't have CR Eddie but have used him as a trooper and came up against a few in PVP. I don't fear teams with CR Eddie as if I go first I pretty much wipe him out in the first turn. Does have some strong points though but eventually you get Grim Reaper Eddie from achievements which gives you a 5* Magus Eddie so thats something to consider I think.
As for MCR though, even with recent nerf, that freeze is dangerous when on the other end of it. I have a MCR and the freeze has saved me numerous times in PVP and quests. Even today on completing the clear LOL X mission with all magus characters, if it wasn't for the freeze of MCR it would have been over. Plus it doesn't need too many skill shards to make it powerful, how many does CR Eddie need? I don't think there is a wrong decision here but I'd go with MCR personally.