The Fleischer cartoons are great little action set-pieces. Don't expect great characterization or anything out of them, it's all about the spectacle of a modern Hercules fighting various things. Mad scientists, robot thieves, bullet-car-driving thieves, Godzilla, uncomfortable racial caricatures (yeaaaah, not great), giant mummies, bird-men-- it's all about the action and the occasional joy of seeing Bud Collyer's Superman voice come out of Superman's mouth instead of just hearing it on the radio.
In Legion Superman and Superman X are two separate characters who co-exist. In season one a young Clark Kent on the verge of moving to Metropolis comes to the 31st century, and in season two an older, more experienced Kal-El joins the older, more experienced Legion in fighting Imperiex, a 41st century threat. Superman X is a 41st century clone of Superman who's DNA has been infused with Kryptonite to make him immune to it, and he also joins the Legion, taking the Kryptonian name Kell-El. Kell is an ice-cold anti-hero who thaws out over the course of the season, but even though the emphasis is on him more than any other season 2 character (except maybe Brainiac Five), Clark still gets a decent amount of attention.
Man, the JL War Superman is so underrated though. He's just good at being Superman! He defeats a brainwashed Flash and Wonder Woman with minimal injuries! He applauds Robin for stabbing him with Kryptonite! He takes less than a second to get Luthor's power armor off him! By contrast, the Warverse Luthor is dreadful... I wish I could see the Young Justice Luthor face off against the War Superman in a season arc, that'd be sublime.
The STAS Superman is problematic in the sense that he's clearly got the proportionate strength of a spider in most episodes and has an obnoxious tendency to get hit by a laser and keel over, but his characterization is really quite good. His powers are just off, that's all.