If the question is about trading on defferent time frames, such as a few trades per day that run a small trend as opposed to a few trades per year that run longer trends, then you need to find the time frame that works best for you.
Longer timeframes are less predicatable from the technical point of view (say, putting a stop 1-2 ticks below the previous low is unlikely to work: a long trade needs certain breathing space.) On the other hand, on short time frames slippage is more of an issue.