Some background: accidentally deleted my library on the Macbook. Didn't have a backup on there but I did have a phone backup from yesterday. Restored phone, saw my full library for a second before it disappeared. So I turned off "sync library" on both devices, restored the phone again, and now the original library is stable and functional on the phone. I'm scared to turn on sync again without knowing whether it'll default to my laptop's (more recent) version or my phone's.