they'd be weaker than the originals, cause they either kill or lobotomise their villains instead of the repeated fights where the villains get out and get stronger or get smarter so that our respective "World's Finest" must battle them repeatedly and fight their own morals being pushed to the limits. I love this though, I'm personally a bigger fan of Earth-3 and the Crime Syndicate cause i like writing drawing The Jokester and Alex Luthor Sr. as heroes. XD
I am trying to redesign him as a heroic Red Hood and the his new Jokester, and redesigning Ultraman cause i always hate his look, i just finished doing Adam the Marvel (Black Adam) and a heroic AMAZ-OS, and hopefully and entire Crime Syndicate and Justice Underground as well. then Genderbenders and Beyond Universe remakes as well. i love redesigns, you should check out projectrooftop.com
Well my only reasoning is that they never have to fight their enemies more than once so they never have to keep overcoming the new or evolved strength they gain, but yeah Red Son Kal-El is a badass in a fight, but i guess it don't matter if one of them flies off to absorb more sunlight, or the other cheats..i wanna see an Infinite Crisis Battle Arena movie for this.
He is weaker, but they've also made him cross lines to compensate by having him murder Doctor Light in battle.