Hey, i'm not long into the mining business and i have some questions.

I finished my first mining rig with 6x Gtx1080ti 11GB and now i ask myselft, what is the best way to mine.

I found Nicehash, and i really like it that they pay you out directly in BTC.
When you mining directly in a pool for just one currency, for example ETH or Zcash, you have to check the market prices every day and you need to exchange them with fees and a lot of work.
So why not everyone is using nicehash? Do you earn much more money when you mine directly?
And are you switching between the coins manually?
Thanks