Hi Biyasc !
Till now i have tried almost all time frames and i find 5 min charts as the most MEANING FULL ones for intraday trading. the probabilities of identical formations or patterns formed in 5 min ( the results ) are much more higher in 5 min.
For eg: if i see a strong formation such as bullish engulfing in 5 min and in 3 min. i would like to place my bet on 5 min for a very logical reason and that is that most of the traders use 5 min and not 2 and 3 min therefore it gives much more trade confidence when we know that a large number of traders are looking at the same.
Plus if you want to keep another eye on smaller time frame, which in my opinion is gr8
, then go for 1 min, used by scalpers.