depends for C-Ryougi. I tend to just stick with 236B for more damage and then chase in the air, but C-Ryougi CAN do things after airthrow... Dash 2A works, dash grab works, dash 5B works to catch jumpouts, etc. Her dash grab beats out Kohaku's 2A mashing on getup lol...
I don't know about H-Ryougi, I haven't played her enough.
I think F-Ryougi should ALWAYS use j.236B as an ender. Lets her land and charge.
Though if your knife is on the ground, you should probably use j.236B and go pick it up no matter what moon you are.
basically, what is rationally the right answer is probably character dependent; dependent mostly on your opponent's air-to-ground
^thisx1000
if your opponent has shitty air to ground, go ahead and do j.236B then chase them with dash and go for AA relaunch.
Though also factor in air-to-air. Ryougi's is pretty strong and she can chase in the air fairly well after j.236B.
I'm thinking about playing all of the Ryougi moons. Dunno about it though, I'm not too bad with C right now, just need to work on my neutral game a bit. Combos I've got down easy.