>>149642075Golden Age Supes is the OG version of the character that can 'only' lift up cars, run faster than speeding bullets, leap tall buildings, etc. Notably, he couldn't fly. He also didn't have his heat or x-ray vision iirc.
Post-Crisis is the version spanning from after Crisis on Infinite Earths to Flashpoint. Granted, his power level fluctuated in this period. Initially, he was depowered crazily from the insanely powerful Silver Age version. Basically if you've ever seen the DCAU cartoon, he was around that level. Think Golden Age Superman but a bit more powerful overall, with flight and his other powers. He couldn't even fly out into outer space without having a specially made suit for that.
Then as time went on, starting from the early-mid 2000's, he got a power boost and began to be powerful again, even being able to fly out into space, lifting objects that were several thousand tons in terms of mass, fighting what you may call 'city-busters', if not planet busters, on much more even footing.
But yeah, Aquaman in the comics has been closer to the latter period of post-Crisis Supes for a long time now. Dude's a beast underwater.