Frieza wins, the cartoon versions of both the JLU and the Avengers are nowhere near as powerful as their comic versions. Yes, if this were comic versions the outcome would be very different, but since it's not Frieza pretty much can kill them all with a single blast.
Superman is the most durable member of the JLU and he was KO'ed from a glancing blow from that fusion cannon attached to the watchtower. Frieza packs far far more of a punch then that weapon does. Likewise on the Avengers assuming this is EMH versions..the only person more durable then Superman would be Hulk, and even then there wouldn't be an utterly massive difference.
So there isn't anyone that could survive his opening blast. Also the only person fast enough to potentially get off an attack at Frieza before he fires an energy blast is the Flash and he just doesn't pack the necessary damage output to hurt Frieza. Before anyone mentions it..nope, the Luthor/Brainiac combo Flash needed several hits to defeat actually wasn't anywhere near the durability of Frieza.
Originally posted by Jmanghan
Oh, and also, Superman has been hit with apparently 15 suns to the face and survived: watch?v=zexXH3lS8UwOh, and I'd also like to add that Superman punched Darkseid SO hard that there was a Sonic Vibration in the air.
The clip you just showed is not JLU Superman. If we're just choosing any animated versions we want then Supes from the Superfriends show was a planet mover.
Also, why would an attack that is "15 suns" hurt someone who gets his power from the sun?