The kinds of plants I was asking about, palmatum and circinatum, though I havent had first hand experience with circinatum, I would say layer easily. With exceptions, for example I tried a dissectum garnet airlayer, and that failed, as you might expect it to. But my non dissectum palmatum airlayers all rooted. I just started this year so if you want me to tell you I have a hundred succesful airlayers lying around, that I cant deliver. But if I try 4 non dissectum airlayers and theyre all successful...
As for cuttings, Ive made plenty of poor attempts, letting them dry out, starting them too late, cooking them etc. But Ive learned a lot for next year.