I've used both and while flex pvc has its place I prefer the ridgid PVC pipe. My advice is to use lots of unions so you can remove plumbing, pumps, etc very easily when you have to. And make sure you leave enough room in your sump that you can pull the plug on the returm pump and the amount of water that flows from the DT to the sump until it stops on its own shouldn't over flow your sump.
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