I must say I loved unicorns before I watched MLP. I´m known for it between my friends. Once I said my dream is to ride an unicorn on a rainbow. That´s it. Another thing I love is rainbow. So..
I started watching MLP: FiM and Dashie became quickly my favorite pony. On other hand, there was Fluttershy, antisocial and animal loving like me. And who doesn´t love Derpy Hooves! But...
The unicorns? I kinda like Twilight, but posh Rarity is "really not my taste". And all the posh ones are unicorns, it seems.
I must say at first I though earth ponies might be boring when there are horns and wings, but A.J. and Pinkie prove me wrong. Pinkie´s insanity made me smile so many times.
So I must say I really like all 3 kinds. According to MLP, my fav kind is Pegasus, though. But in anything but MLP world, it will always be an unicorn... dashing on a rainbow. ;3