This would be a awsome battle to see, I dont know who to lean towards just yet lets see some facts here though:
-Reed is by far the genious here, Tony is smart , but pales in comparison to Reed.
-Hulk has taken on the entire FF team before with excellent results
-Torch does have a extreamly powerful attack (probably the most powerful in the bunch) with his Nova blast. But can only use it once, then he's practicly powerless for some time
-Captain A is the best fighter of the bunch, and even though he might not be able to really harm Reed, a few smacks in Reeds kisser with his shield would sure daze him
-Invisible Woman is probably the most underated person here. She has a huge arsenal of abilities with her powers, and might get overlooked
-Thor's hammer has practlcly a unlimited amount tricks itself, not just call lighting and smack some heads.
So maybe I just might barely give this one to the avengers ..barely
couldnt get Sue in the pic