It honestly just depends on the woman
MFF - it has a much higher success rate because the women actually interact with each other. They hype each other up when taking the D, push her head down on it, will make out and go down on each other.
MFM - the men don’t acknowledge each other at all. Haha. We don’t want to touch each other and we’re not complimenting either. Also, most women just aren’t good enough for it. You’re getting the worst BJ ever because she’s so overwhelmed with D she can’t focus on oral.
If the woman is experienced, it’ll be a good time no matter what. But MFF is never not good.