Agree to disagree on Onana. Defensively he's an animal, levels above Bissouma in that regard. On the ball he's unspectacular but safe, and underrated. He doesn't have Bissouma's ball carrying ability (not that we've seen much of that since October) but he certainly loses it far less.
Onana vs England
As for Bissouma's consistency, this is just who he is, Brighton fans will confirm. He's either the best DM in the world or a disinterested liability. Sadly for us that ratio has been roughly 1:10 in his time here, can't be relying on someone like that in such a crucial position. Give me 7/10 Onana performances over that any day of the week.