I've tried everything and keep going back to corkies. They float well, respond to strikes well, and don't get cuaght up in the wind or anything when casting (they go where ya put 'em). I just vary my sizes depending on river, etc. For the Bow about 1 inch... for Crow and mountain streams 1/2 to 1/4 inch diameter. Works great for me, I get my share of fish
It's more about drag free drifts than anything else, indicator or not. Do whats comfortable to you, but get the flies in front of the fish and drag free - and you'll be successfull anywhere.