I like Database as much as you guys. But I looked up the lyrics for both Different (the OP for Season 3) & Database; if you ask me, Different is
a lot more fitting than Database for Season 3's OP.
Kobato from BAND-MAID herself even said that Different was specifically made for this season of Log Horizon:
"For the lyrics, I read the original novel and wrote the words that are used in the anime as well, keeping in mind that they have a strong impact. I wanted the lyrics to be suitable for people who like the original novel, so I chose the words carefully." - Kobato (BAND-MAID).
Edited 1/12/2021:
Well, here's a bit of substantial news, Funimation now has Season 1 available for viewing. Both Sub & Dub.
Twitter Announcement.