I have been using Resilio Sync between my Mac, Synology and an android e-ink tablet. Everything was working fine when I set it up, then a few months later when I wanted to transfer something I discovered that Resilio Sync on the Android e-ink tablet had forgotten about the shared folder. Trying to set it up again is a pain. I would prefer AirDrop over Resilio Sync any day of the week.

Resilio Sync is also incredibly slow when the two devices are not connected to the same network. Like kb/s slow.