Charmander. All the way. If this is for real life it would be a Charmander, because it's cute, useful for Camping and roasting Weenies, and because most people know that it's a Pokemon. Not everybody would know Eevee's and Eevee and they might just think it's a fox of some sort.
Now if it's just ingame, I'd have to go with Charmander again. They are awesome.