I am interested in knowing which season premiere or finale is your favorite one.  There are 3 finished seasons so that would mean there are 6 season premiers because they always make part 1 & part 2.  There are 3 finale's too.  

My favorite season premiere is the return of harmony because I think Discord is the best Antagonist other than Chrysalis.  

My favorite season finale has to be Magical Mystery Cure because I love the storyboard at the beginning and I think that it is really cool how Twilight turns into an Alicorn and a princess.