I'm already sensing a Kelly/Sabrina storyline (for those of you who watched 8th & Ocean), and Im betting Amanda is going to be the twin who always gets what she wants and is well liked, while Michelle is the more athletic and unpopular twin who has always been slightly jealous of Amanda. And in the end, Michelle will last longer than Amanda just so she can finally prove someting to both herself and her twin, Im sure.
That's my guess.