My vote goes for Super Meat Boy as well, even if I really enjoyed Comic Jumper. The content for 800 points is really a LOT in SMB, but remember that you'll hate the game as well. I was almost in tears several times due to being so frustrated...but in a good way I guess! :)
Super Meat Boy all the way man.
Comic Jumper has some pretty funny moments, but it's pretty repetitive. And even with all the upgrades it's kinda hard to feel like a superhero.
SMB however has variety in it's level design, is cheap until November 1st, AND has a great sense of humour.
Its really hard to say it depends on the type of gamer you are, if you want to laugh or you want to do some crazy platforming. I would say comic jumper is really funny but the gameplay is very so-so to the part of just wanting to get to the next funny part. super meat boy seem luck a great nod to retro gaming which is great to see and it can be very hard to the point of you doing somethihng over and over just to make it to the goal. Good thing is the level are not to long so you won't feel too cheat.
So yeah in the end if you want to have a good laugh and can get over some repetitives gameplay get comic jumper, but if you want a good retro trap down memory lane and do so hard platforming while seeing some familier faces and scenes get super meat boy. Also it may be worth saying super meat boy is 10 bucks right now(will change in november) so that may help in you choice