8 and 9 max, rarely play 6 max, if I do, mostly CGs. Obviously you have more action on a 6 max, if it counts for you, for me it is a disadvantage as well, as I can't play, focus for the same number of tables like in 8,9max.
You can have 'strategies' on any, not important what you mean exactly. For that, what and how I prefer to play, the 8,9 max is more suitable.