I'm going with Marvel due to the technology created by Reed Richards, Victor von Doom, Hank Pym, T'Challa, and Tony Stark. DC on the other hand has Lex Luthor and.....Lex Luthor.
You're limiting it too much.
DC has:
The Cosmic Treadmill, the various Lantern Corps rings, the Monitor's tech (and the Anti-Monitor's stuff), all of the New Gods' technology, the Manhunter robots, STAR Labs' tech, Legion flight rings, basically everything else that Booster Gold stole in his origin, the crazy crap Batman and his rogues come up with, Toyman's tech, and yes, Lex Luthor's inventions, among many others that I'm sure others could mention.
Marvel has:
The Ultimate Nullifier, the Cosmic Cube, the Infinity Gauntlet, the inventions of Richards, Doom, Pym, T'challa, and Stark, Cerebro, Hank McCoy's inventions, Spidey's webshooters, web fluid and spider-tracers (as well as Ben Reilly's toys), any and all of Bruce Banner's gamma stuff, the Goblin tech, Mysterio's toys, the Spider-Slayers, the Sentinels, Ultron, and many others.
Like I said, they're even.