Like this poll bro, I have though about their development influences too.
The people who bear with me know all too well I'm a die-hard serperior fan, I'd totally prefer serperior over other pokés but when it's time to talk avoiding fangirlism I can't say a lot 'bout serpy:
Whose design do you prefer?:
Serperior. Since I saw it in BW I picked it all the way, which is rare for me since I'm one of taking the water starter since 1st gen.. Kinda hard too 'cause I loved Unova starters. Not saying Chesnaught designs is ugly but between them, I prefer the beautiful and elegant serperior.
Who has the better pre-evolutions?
Snivy and chespin? Snivy, it's of the cutest.
Servine and Quilladin? Quilladin, just for the poké amie I guess.. his open mouthed face it's just too adorable <3, and when he smiles... I got kinda scared of servine's look when you pet him in the wrong place, you only get to see its angry red eyes >_<.
Who would win?
Looking at their stats it's easy to define Chesnaught is far more powerful than serperior, the snake 'mon only wins in terms of speed. With his poor attack and sp atk even its cool HA contrary it's not much help against another grass type.
Hard to admit, Chesnaught.
Who do you prefer?
No matter if it's not very competitive or its design might not be the best for certain people. I don't care about stats and fancy things when I choose my fav 'mon, so sticking with serperior. My fav 'mon ever~