I looked at both a Samsung Galaxy S6 Edge (not an Edge+ though) and Nexus 6 when shopping for my last phone. I thought that the S6 was very nicely designed, had a great display with that very cool looking curved edge, and was powerful enough to run everything very smoothly. It was a very nice device at a premium price.
I ultimately went with the Nexus 6 instead for one reason: The Galaxy has Samsung's TouchWiz UI. I greatly prefer the standard Android UI, enough for TouchWiz to be a deal breaker for me. However, if you don't mind it, The S6 Edge+ is a fantastic device that is one of the finest Android phones currently available,