As far as the speed and intuitive navigation concerned, Jumble is hands down the winner. Smooth as butter, no pending UI hanging forever when there are no notes or other crap that is being loaded, attention to details. I’ve tested 90% of clients I could find and all of them had some sort of obscenities or UX issues. Even basic button click, and immediate show of pending UI is absent on majority. Performance is another area, where bloated clients are taking multiple seconds to load anything. Some do not even have a way to login (in obvious way) while asking you to log in. It is sad show from my testing.