Still stuck on the button thing. DianeH's comment was right on target. No single button came out ahead of any other. I'm on my own.
I have at least narrowed down my choices, though.
Neither button calls for a large button hole. Which means so I can go ahead and do the math for yo/K2tog eyelets instead of the more tedious one-row buttonhole.
Well, at least I'll be able to finish the knitting part.