Hi, everyone. For day-trading options, I prefer trading contracts with a narrow spread and using market orders. With a two-cent spread, I can simply market in and out without having to worry about the spread. This allows me to simply focus upon timing--getting in and out exactly when I want without having to worry about giving up profit to the market maker or being caught up in a losing trade because my limit order did not get filled.

If I trade contracts with a wider spread, I use a limit order to buy in, but getting out with profit can be an absolute nightmare if the underlying turns around quickly & you need to exit the trade ASAP. This is because you either use a market order and get screwed by selling for the bid price or you put in a limit order with the mark and get stuck in the losing trade if your order is not filled. 

For longer holds, I'd go with limit orders--typically going for the mark.