Should I appeal my paper's rejection in PRL?
Remember that editors often have to reject papers even if all reviews are positive. The reviewers only see the paper at hand, the editor sees all papers submitted, and all papers with only positive reviews are often still way too many to be all accepted. So by necessity, the editor also needs to reject papers with all positive reviews. Passing the hurdle of getting all positive reviews is often a necessary but not sufficient condition to be published, your paper also need to be better than a large portion of other papers that also passed that hurdle.

Bottom line: fighting editor decisions is usually not worth it, especially if you have another accept ready.