With the first pick in the fake NFL franchise draft ... Warren Moon tells TMZ Sports he'd take Patrick Mahomes over Lamar Jackson!!!
... but, the Hall of Famer says it ain't an easy decision!!!
Mahomes and Jackson are set to square off on "Monday Night Football" this week ... and when we asked Moon which young QB he'd rather have -- Warren went with the Chiefs star.
"I would probably go with Patrick Mahomes right now because he's the reigning Super Bowl champ," Moon says.