6, I always do 6. I don't make cabinets but I do make custome arcade sticks and all of mine have 6 buttons. Now for me this stems fromw hat I use them for, fighting games. Most fighting games use 6 buttons and people will sometimes use 8 to put a button combo on the last 2 to make certain things easier to do. In tournaments this is illegal so I got out of the habbit of short cuts quickly.
Now most non fighting arcade games use 3 to 4 buttons so 6 would still work. And if you wanted to play some street fighter or MvC2 you will be ready to go with a awsome setup.
Now most non fighting arcade games use 3 to 4 buttons so 6 would still work. And if you wanted to play some street fighter or MvC2 you will be ready to go with a awsome setup.