I don't like the clear elbows. I've dumped enough to know when it's done, I don't need to see it happening lol.
I have an el-cheapo hose for dump stations, and a Rhino Flex (2, actually) for hook up sites. I don't really care for the rhino for quick dumps, it's a little harder to handle.
I have connectors on both ends of all hoses so I can connect them all together if needed into one long hose. It also means I can connect them to themselves after use to eliminate any smell (I store them in a large plastic tub in a storage compartment, connecting them to themselves keeps everything clean in there). Once back home, I can do a good rinse and cleaning if needed.