Typhlosion, Meganium and Serperior, mainly because both have very relatable designs to their base forms and that is something I appreciate. Sceptile is also cool and relatable to Treecko, but I wish it stayed in a quadrupedal stance in its artworks/sprites, it looks way better that way. Its bipedal stance always bothered me.
Good ol' Charizard's always first. Apart from that, all Hoenn evos were nice, and all Kanto/Johto non-fire evos were awful! Typhlosion's nice, and Torterra/Infernape appeal to me as well. Empoleon, Serperior and Emboar are a no, yet Samurott looks pretty nice!
Let's just wait to see the Gen 6 final forms... Froakie's evo, beware!
I really can't choose my favorite final form out of all of them, but I think I just might be able do it it by type.
Grass: My favorite grass starter's final form is Sceptile. My uncle gave me Sapphire Version with an EV trained team, and the Sceptile was named after me.
Water: Blastoise. It looks bada**.
Fire: Fire has to be Charizard. It was my first ever starter on my dad's copy of Red Version.
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I'm voting for Venuasaur (Venuasaur for Prime Minister!) I love its design and its really helpful and firered and leafgreen
But the other grass final evos have always been my favorite.
Smart enough to use forth in the wrong context
Claims: Metagross and Travis Touchdown
Because I can still cook him.