Depends on the vagina and the woman giving you a blowjob. Each has its own pros and cons.
Lots of men prefer blowjobs because the sensation of a woman’s mouth can feel even better than a vagina in many circumstances. Plus, it givesherthe opportunity to take control and pleasure him. All he has to do is lay there and enjoy it!
Mouths also have the benefit of being pretty welllubricated without any foreplay necessary.
Vaginal sex on the other hand allows the man to control the tempo and pace a little bit more. The vagina is also a little more textured and can grip just as tightly plus the feeling of being able to thrust in and out the way nature intended really is something else!
Most men prefer both at different times. Having a woman willing to let you use any of her holes is a lot of fun, since you can mix it up whenever you feel like it!