A. TIE fighter is faster and more maneuvarable, however they do not have deflector shields. Also, they don't have any life support, but that's not relevant here. X-wings have deflector shields, which causes their power regulation to divert from engines. They can take a beating. TIE fighters are considered more offensive, and typically only fly in squadrons (4 starfighters).
I hope that is what you were looking for. Pass on a question regardless.
In regard to the ownership of R2: I'm willing to bet that we see the droids head off to Alderaan. I wonder if Captain Antilles serves a similar role as Captain Panaka in EP1. Of course, there are other threads for this discussion.
Let's play some trivia!!!!!