Having used both, Sync is better. Liftoff felt light years behind Sync. I will also note as a purely anecdotal, I saw more duplicates on Liftoff than I do now on Sync… I still see a lot of duplicates but not nearly as much as before… Grabbed, I was using Liftoff when the Reddit migration was occurring so that could be the reason I dare more duplication with it.
There’s no year listed. Just a month and a day.