Ironically, more people responded to this thread vouching for the Rhino Flex and yet, I've decided to go with the Valterra. The Rhino Flex is probably in use 10:1 over the Valterra just based on Camco's distribution reach. I've only seen the Valterra at Camping World while you can Rhino Flex at Walmart and every place in between.
For me, it was the non-fussy, fixed bayonet fittings on the Valterra and not wanting to discover that there was a problem with the bayonet until there was sewage waste spewing around the dump station. YMMV
2014 Ford F150 FX4 EB
2015 Grey Wolf 26DBH
1994 Palomino TXL