I take this to mean you have an area shaped like a bus (say 15m x3m) with 50 clients all watching a streamed video at the same time.
You are hoping for 50 x 2.5mbs throughput with some buffering.
You have this in place already but as a wired solution and want to go wireless.
You are asking which is better
one high spec AP better (ie 7372)
two lower spec AP (ie 2x 7363).
This is the point at which you need someone with these particular APs to tell you how they perform in the real world at these loads. Spec sheets and quoted theoretical numbers are all very well but not the whole story.
Also (dumb question)...is your wired network gigabit as you'll need that for the APs to connect to or else their wireless throughput will be constrained.