Which has best move pool and stats.
I'll go with swampert because he is an excellent tank and he has got a very huge movepool. He is also the starter with the higher total stats and have got only 1 weakness, the grass type, which can be covered with an ice type move
http://pokemondb.net/pokebase/4988/what-is-a-good-moveset-for-swampert ...for a good moveset.
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