Both have to go.
I can hold my hands up and say I was a big fan of Bissaka and genuinely thought even at the sky high fee, he would be a top signing and develop into a fantastic right back. I do still think he can develop into very competent one but he simply hasnt progressed here and the weaker areas of his game let him down.
But DAlot I simply see a piss poor modern full back. Carries the ball ok, simple passing ok, shooting can be good...........but one on one, positioning, crossing, decisive passes. tracking.......basically he does the bare minimum aspects of a modern full back going forward quite well, defensively he is an absolute shambles though, feels to me like 30% of the time he makes a tackle he gives away a foul.
Be a big mistake for me if we start next season with Dalot as our starting right back, though both should go, personally if we had to have one, I would still rather Bissaka all day long