I'll never agree with you

"I'll never agree with you" or "I'll never be in agreement with you" But the first one is more common.

Jonathan, I think the best way to say it is: "Never will I agree with you." Let's wait other answer.

or just say: "I am right, you are wrong! Accept it!" :-) But without joking I would go with "Never will I agree with you."

I'll never agree with you or I will never agree with you (: