I’ve downloaded EtchDroid, but only a few minutes ago. I see straight away that I can’t download different distros from within the app like I could in DriveDroid. I’m also not sure I can boot from my phone using EtchDroid, but I will look into that a bit more as it does often seem to be mentioned as a (good) alternative to DriveDroid.

Any others? Mainly that I can download distros inside app, boot from phone in live usb mode, and without root.