Thank you all for your thoughts! I had a few reasons for looking at Buffalo. We were looking for a quick single-day trip (going up the night before to allow an early start) that's within our capabilities. Part of it was also that I love Mt Buffalo but I haven't explored it properly, and it was a good excuse to take my wife there. It was also a process of elimination; I've been out to Feathertop several times on snowshoes and I thought it was probably too advanced for relative beginners. Stanley Bowl on Mt Stirling might be OK, but that's a half-day walk as well. The west ridge of Mt Buller was too challenging and the ski patrol would probably kick us out of the resort areas, and thus I arrived at Buffalo as the last mountain standing, although I realise the snow can be variable there.
I will have another look at Mt Feathertop; possibly the bowl below Federation Hut might be suitable, or if not we might have to bite the bullet and head up higher. Thank you all for your ideas.