Ah, but Elros did not marry an elf, either.
Elros chose to be mortal - married a mortal. Hence, children were mortal. Aragorn marries an immortal (just like Beren=Luthien and Tuor=Idril) and children ought to get a choice, theoretically.
I would guess that a choice would be given to Aragorn's offspring, as was done to the other half elven, since they were truly half elven (actually, slightly more than half, I should think...)
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