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If all the parts are reusable, does it really matter whether it's SSTO or two-stage?

If you drop stage 1 in Earth's gravity well instead of Mars's.. yes it does :)

Edit: as mikeash points out in the reply, I'm plain wrong. You could use multi-stages to accomodate different gravities when launching Earth-Mars-Earth (2 stage E->M, reusable as standalone second-stage, so single stage M->E).

A stage built to launch from Earth will surely be severely suboptimal for launching from Mars and vice versa. You'd want to use a first stage that returns to Earth to launch a separate Mars stage if you're planning a return mission.

yeah, for musk's platform, realistically for the first [N] launches he's only going to be using the first launch for humans and subsequent reuses for non-human launches, where [N] is some number sufficient to get good statistics on reliability.

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