Quote from brocklanders:
I'm pretty sure you've asked this question before on a previous thread but I'll play along anyway. I'm bored.
Do you use market or limit orders to enter a position? Yes
I use market orders in a fast market or when I do not have a specific price in mind to buy/sell at when I am first entering a position. This usually occurs because I am waiting for the market to give me an indication and once I get it I get it in at the ask price for a long position or sell at the bid price for a short. Limit orders are also useful for entering positions as you can plan your orders ahead of time and sit back and wait for the market to come to you. I find that I usually get worse fills when I am chasing entries with a market order.
I use limit orders mostly when I am exiting a position (either a predetermined profit target or stop limit order). I occasionally use a market order to get out of a position depending on market conditions.
So, my answer is it all depends. Both are valid for different reasons. As far as percentages go probably 70% limit and 30% market.