I have preferred Squirtle over Charmander the moment I laid eyes on it.
I love all the Eeveelutions, though Jolteon is my favourite. Leafy and Umby come close second and third, respectively.
Never been a huge fan of Pidgeot or Magmar...but Scyther and Luxray are awesome as heck. And Marowak, Dugtrio, Exeggutor, Tyranitar, Typhlosion, Delibird, etc...
Speaking of Scyther...I like Scizor even more. B)
Then there's your newer ones like Blaziken, Staraptor, Zoroark, Dragalge, Absol, Honchkrow, Persian, Skuntank...the list goes on.
BUT...I cannot stand Luvdisc, Basculin, Masquerain or the infernal Unknown. Just....too many bad memories