I imagine it must be very weird to look so similar to your sibling. My two brothers and I look so unalike that people are often surprised to find out we're related. And before the mailman jokes come in, we do all share obvious features from our parents, just each jumbled up in a different combination. I can't imagine constantly seeing someone that looks like a slighty off reflection of yourself. It would really annoying if your sibling looked very similar but was somehow better looking.
Regarding the Cruz sisters, I can't really distinguish which one is hotter. Both are stunning and I would be thrilled to land a girl that looked like either one of them. What do their parents look like for both girls to win such a jackpot on the genetics lottery?