Depends on what type of Trader you are. A breakout/Aggressive trader generally use SL M/Market orders. Conservative Traders prefer limit orders. I guess it has more to do with the type of setup you want to trade. I am a breakout trader and mostly use SLM orders.
For a scalper limit entry orders are better as it will save slippages. But in that cases one might miss the trade itself.
just my two cents,