In 15 minutes timeframe, chances of seeing several actions are always possible. In general, that's the initial timeframe you have to consider first then just jumps to others if you think it's not quite effective.

However, not all coins are fit for scalping. It will be purely based on the coin's behavior, therefore, no specific timeframe should be prioritized. There are some cases of other coins who will be overhyped at given shorter frames, in here you have to be careful.

Make a test of strategy always. Different trades have a different approach when dealing with scalping.