I don't know about you, but whenever I've had schedules where I didn't get two sequential days off in a week I'd tire out waay fast.
In your situation, I'd probably pick Sunday+Monday as my weekend. You get the extra for working on Sunday, and you get to avoid the stressed people on Mondays. It is nice to have one conventional weekend day off, the other commenters aren't lying when they say working weekends limits social opportunities.