Marill has better base stats then Lotad though Lotad is an Duel Water/Grass. On paper Marill is superior however it is more of a personal play style choice.
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You can obtain a Lotad in the Safari Zone.
Marill evolves to Azumarill and its preevolution is Azurill.
Lotad cannot naturally learn it but it can be taught Thief with a Thief TM. Lotad's evolved form Lombre learns Thief at Lv. 37.
Marill evolves into Azumarill at level 18.
Marill doesn't learn surf naturally; must use hm