From the answer here:

• Only use WOFF2, or if you need legacy support, WOFF. Do not use any other format
• (svg and eot are dead formats, ttf and otf are full system fonts, and should not be used for web purposes)
• By the estimate here, WOFF2 should work on 95% of browsers.

WOFF2 has a 30%-ish size improvement over WOFF when using compression/brotli.