Neither Severino or Wynns is a good option, however, I’m surprised no one has cited any other defensive numbers besides the questionable CERA.
It’s pretty clear Severino is horrible. Wynns isn’t great, but he has thrown out 50% (yes, SSS 6 of 12 but I’ll take it) of base stealers this year. He’s slightly below average (-2 DRS, Severino is 28% for his career, but only 19% this year and -6 DRS, -15 career.
Framing? Wynns -1.6, Severino -6.3.
How about passed balls and wild pitches? Yeah, SSS for Wynns again, but 0 PB and 5 WP in 125 innings. Severino has 8 PB and 34 WP allowed in 484. He’ll surely blow by his 2019 total of 10 and 40.
He’s quite possibly one of the worst defensive catchers I have ever witnessed and certainly not worth what he’s being paid.