Okay, some of my friends and I got into a bit of a discussion on who would win in a head-to-head: The Avengers, or The Justice League.
Also, as part of your consideration, it is important to note that Spiderman (due to production studio rights buy-outs) is going to be an Avenger.
The choice of "Avengers (w/Spiderman) is if you think the Avengers would ONLY be able to win if they had Spiderman on their team. If you think they could win on their own, pick Avengers (original).
I'd love to see your reasons for this as well.