Ulquiorra palmed a getsuga from a dude who with a simple swing, quite casually dispersed a cero with that could warp space with residual energy. Ulquiorra could blow away a good portion of his reiatsu with a normal cero implying power very far beyond that. The intensity of his reiatsu grows 25× more powerful at full power.
Whitebeard one shots. He's tier above characters who would stomp Ulquiorra.
As I have been saying
Almost this. Ulquiorra is more like Luffy tier. Also people seem to forget that Ulquiorra doesn't start in his 2nd release and use lanza's that frequently. Though this honestly would be a viable way for Ulquiorra to win if he were to stay in the air and spam lanza's on Whitebeard. So overall I'm going with Whitebeard 8-9/10.