I'm going with DC even though he's a huge favorite and I like Stipe to retain. Ngannou was impressive in his last win and could knock Stipe out but I can't say no to a good champion as an underdog.
I think Ngannou is gonna KO'd Stipe in the first round. Stipe has a soft chin, he was rocked by Overeem with a glancing blow, Ngannou is a beast