This would produce the most gains , but if you predict wrong you could be stuck waiting for the price to either come back up or down to get back in. I did this the other day. I sold and bought back in at what I had predicted was going to be the next upswing. However some last second sellers swooped in and dropped the price below my limit. Then it just continued to fall from there. Now I sit and wait for the price to come back up to my purchase price so I can get back at it. I hate waiting. I get antsy. I should have left some money in reserve so I could have at least bought in at the bottom. I got greedy. Now I wait. 
Considering that you go all in, better to make sure that you fully understand and you already assess well any investment that you take place, trading is a game of patience so if ever you see a downfall then not to fall into panic as you know that the value will bounce back, that's how important reading andanalyzing the project that you will going to invest your money, the more you understand the more you will be able to hold and trust the system, patience will give you a lots of gains...