Every time frame is profit able, however the correct question is which time frame most profitable for you.
To answer this question you must know self. If you act fast pace person, you will feel more comfortable and think clearly in lower time frame; if you are patient , slow pace person, you like slow and steady time frame like H4 and above.
Pro scalper can make more profit with the same amount invest compare to long term trader. However long term trader normally can absorb more emotional trades and stay with the trend longer.
I hope that help