easy.
first choose them legs so that she thinks she has milked you all out already but in truth you havent been completely milked yet so that later on you go and get them bewbs for the real milking!!
just dont get easily milked and you get to taste them both juuuust fine.?
Considering in the last page she basically has absolutely no ass (which is the most important) whatsoever, the single teacher is a WAY better choice. That, and she has a job and a useful skill