Speed. Meta's process takes - weeks. Google takes - weeks.
Coding environment. Meta uses CoderPad (real IDE with syntax highlighting). Google uses Google Docs (plain text, no autocomplete).
Team matching. At Meta, you get an offer first, then match with a team during a "team shopping" period. At Google, team matching happens before or after the offer.
Behavioral weight. Meta has behavioral round that's weighted less than coding. Google's "Googleyness" carries equal weight to coding.