CE is great, but there are some stylistic changes that will be hit or miss for some people (clean guitar tone change, outro strings, missing phase sounds in outro).
But Megalomania IMO just sounds better in every way. The bass in the chorus is SO good. Previously could only hear that in live performances. I don't feel like I'd honestly have any reason to listen to the OG mix of Megalomania now but original CE will still serve a purpose.