its reliable, easy to use, hassle free and important for me, allows a decent and steady profit control and prediction. Tried different pools and miners in the past and stuck with both nhm legacy and nvidia version for my rigs since quite a while.
Yes you can make more profit by manually switching algos, optimizing configs and watching the market etc., been there.. i prefer the comfort option here and willing to accept lesser returns as trade off.

In the End it really depends on your setup and *crypto-personality*, whatever floats your boat.