I've been meaning to ask and this reminded me too. I wanted to know the exact differences in choosing between the MMF or MFM versions. Cause I know different people have different ideas and the like, so I wanted to know exactly what you have in mind.
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Same story, one just has three way explicit content (MMF) whereas the other has the guys taking turns with the MC but not being intimate with one another (MFM). Regardless of the mode, the MC will generally be the focus of all explicit content. I wrote a more comprehensive breakdown of MFM vs MMF in erotic romance on Tumblr and free on Patreon if you'd like to learn more.