Argonians can breathe underwater, are naturally stealthy, magically-inclined, physically strong, and blessed with incredible regeneration abilities, immunities and resistances by the Hist. It sounds perfect to me, with one problem:
Black Marsh just sucks. Not as a fantasy setting, but as an actual place to live. I would be forced to spend my younger years in that primitive and disgusting place if I were Argonian, which I would be none too pleased with. Then, if I decide to leave and go elsewhere, I'll be constantly harrassed by racists.
Being an Altmer on the Summerset Isles would be the easiest path honestly.