Your question should be "which is wiser" rather than asking about it is easier one. Because, targeting some profits on monthly basis will get you to actual what you are looking for. We all know that day trading is always profitable one as short-term predictions will not work all the times for any trading pairs. But, position based trading may get more chances to fetch big profits. As of now, I believe you cannot target for monthly profits but you may go for long term holding like holding for three or four months so that you can get more than 30% profits also.