I like the Tintri based on my experience with it.
I wrote my 2 cents about it here http://www.neeshanpeters.com/storage/tintri-datastores-a-customers-perspective
Remember to look at the array as a whole and just not for storage. The landscape is changing and Performance and Storage in an array can be separated easily. We have many Tintri arrays and all have worked great so far. Our sister company has them as well as a Nimble.