This question is not limited to what you prefer from a provider in a MP.   Just in general.  I think the answer will be 50/50.  Will be interesting to see the reasons each individual chooses one over the other. Oh and to clarify, let’s make this bareback.  No condoms involved in the act.  So oral pleasure vs. vaginal pleasure. 

Here is my take on each.

Blowjob is better:

Nothing like being woke up with a hummer.

Nothing like seeing a beautiful face with your cock in her mouth.  The visual is so damn good! 

The sensation of cumming in her mouth is better than cumming in her pussy.  And no worries about getting her pregnant. 

A good blowjob takes the stress away instantly.

A woman that gives excellent head can make your eyes roll to back of your head.

Oral sex is easier to do outdoors and in the car.

The sloppy BJ and suction noise she makes it amazing. 

Sex is better:

Watching her face in ecstasy as you’re giving it to her is awesome. 

You can fuck in more positions than you can from a BJ.

Nothing like a tight pussy engulfing your dick with each stroke.

If you’re an ass man, the view of her ass bouncing on your dick is priceless.

Hearing her scream and moan can’t be duplicated with getting head. 

Making her cum from you banging her is a big ego boost.