Males can still get females pregnant for awhile after they are fixed - some say the sperm can only live 2 weeks, but I've also heard that it's longer then that. So you shouldn't get the male fixed then let him back with the female right away because she could still get pregnant from him for awhile.
If you got them done at the same time, then you wouldn't have to worry about that.
If your set on not getting them both done at once, I would say get the female done first. Females need a longer time to recover, and in my experience, females are more likely to develope aggression problems when not fixed (cage aggression, ect).
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