I personally wouldn’t bring an expensive rain cover again.
In May, our heavy duty, high quality rain cover for our double stroller was stolen while we were in the Epcot character spot. We know we had it because we walked through a downpour to get there. There was no wind in the covered walkway, plus it was really tight fitting so there was no way it could have blown away.
People always say to not leave valuables in the stroller. I didn’t realize that during a rain storm, a nice rain cover is considered a valuable.
I’d buy something inexpensive, and get a couple of them so I’d have a backup just in case. Or, if something happens to it, you can always just make a makeshift cover with ponchos (which is what we did.)