Depends greatly on the type of ground and more importantly, ground cover! If you are in small woods with a lot of cover, then you need to be close, and the only way to get that close is from a seat. However, larger woods with sparse cover might favour being on foot. I also seem to get more Does from seats above cover as they rarely leave it! Foot stalking I'll generaly get more Bucks as they will roam around more to visit more does.
Both methods are productive in the right area!
I've often shot 3 or 4 from one seat. Most I ever had was foot stalking though - 9 Munties and 2 Roe Does in one afternoon stalk!
I've never got close to that number before or since though! Just one of those very lucky 'Red Letter Days' I reckon?
MS