Of course mine was Brisingr, it is by far the epicest. I like how Murtagh whoops Eragon with his awesome powers O_O
Brisingr, without a doubt.
Actually, my favourite has to be the 1st (Eragon). I just love the whole "normal boy turned into a hero, thinks he is strong but has to prove himself and train a lot" concept :) Though I love the others as well!
It's been a while, so I really don't remember why... but I love Eldest!
Eragon: Quite nice for a simple read but a bit too simple sometimes.
Eldest: A nice balance of simple and mind blowing complication.
Brisingr: A bit too long on the Dwarf leadership debate. Too little action
Inheritance: Plot to rushed in my opinion: "let's capture Dras-Leona, the second biggest city in the empire, with a tiny army in two chapters!"