Suggested by Random Jiren is one of the strongest foes we’ve seen in all of Dragon Ball. His skills should not be underestimated. That being said, Vegeta is a proud Saiyan warrior and he would wipe away Jiren’s confident smirk in an instant. Jiren will have to get serious to fight Vegeta and even then I don’t think it will be enough to win. Vegeta does have the power of a Super Saiyan at his disposal after all. He will keep transforming until he wins and will accelerate past his limits! Vegeta wins.