I use my buttonholer attachments for the Singers by choice, they do by far the best buttonholes of all of my machines. The ones with the templates are quickest, you just drop the template in, and go. The manual ones take a minute or two to adjust.
At a push, I will use the Pfaff 1475 automatic buttonhole function, but strangely, this works better without the buttonhole foot. The Bernina 730 I have never got on with, it's a bit of a fiddle for me.
Jessie