Season 3: Elena fell in love with Damon😍

season 2-3 cause Tyler turns into a werewolf for the first time on season 2 and season 3 he meets Hayley.

Season 3 cuz stefan becomes the "ripper" or bad guy , he is more much fun than the old Stefan, And Damon has much more time with Elena.(just my opinion)

Season 3 b/c The Originals came :D !

season 3

Season 1

TVD: S2

TO: S1