I personally trade off of 3M and 5M charts with various matrix indicators plugged into 2m, 3m, 4m, 5m, 6m, 8m, 10m and 13m charts. But I think TFs are totally contingent on the methods you are using and how tight you want to trade. I momentum trade when I can (trending markets) and scalp when I must (range-bound markets). The key is always to take (and to be able to take) what the market gives you ----- sometimes a great deal, sometimes very little.