There are many ways to come at this, but here's are some differences I noticed. I've read quite a good chunk of both versions of Superman, and the Rebirth comics just recently. Others have filled in a lot of it, so I'll try not to repeat it too much.
Superman of the New 52 had a suit of semi-bonded quasi-cybernetic Kryptonian technology that basically acted as armor, hazard suit and (in some fashion) certain capacities to channel/redirect and husband Superman's superhuman and biological energies. It seems it may have been of a more generic type, though what its original exact purpose was isn't revealed to my knowledge.
Superman of "New Earth" and "Rebirth" has a spandexy-suit that is more or less made of super-cloth. It's probably about as indestructible as the SuperPower armor of N52, but doesn't seem to have as many technological elements to it.
Both of them are outrageously, physics-defyingly strong, fast, and durable. Inconsistencies are about as common with both, especially with the recent events effects on their powers. Both of them have some kind of superhuman intelligence, though the New Earth/"old" Superman is a bit more practiced in exploiting his ability to understand basically anything he takes the time to investigate.
I really liked the techno/armor aspect of N52 Superman; the story is slightly insane but all these continuity twisters are. I like both characters, and can deal with having a "new old" Superman, as long as they don't change him out in 5 years again.
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