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Personally, I love them all. I almost always use water-type starters. :) I voted Squirtle just because it's the original and it was my first Pokemon, but I seriously couldn't choose between them all...
Squirtle was my starter in Blue/Leaf Green. I like Squirtle the best because of it's final evolution, but Mudkips are very liekable as well.
I searched for hours in a swamp in hopes of capturing a Mudkips. o3o
I rather start with Charmander in FireRed and LeafGreen in Kanto, Totodile in Shiny Gold and Shiny Gold X (a two way hack of fire red) in Johto, Mudkip in Ruby, Sapphire, Emerald in Hoenn, and any starter in Diamond and Pearl. That's my rating of starting with whom.
So I hear you like Mudkipz?!?! lol. no...totodile all the way! In casual terms I'd go totodile *cuteness factor* but on the competitive term end, Swampert is an OU beast, so Ill go with mudkipz :D