My concern with Nicehash is that they hold you money for several days and then use bitcoin which is expensive to move around (if you only have 1 rig like myself).
It doesn't really matter.... Whatever coin you mine you can always exchange it for whatever coin you want to HODL or for BTC on any exchange....
I mine ETH on nanopool 15 days a month and use whattomine.com to find another alt to mine the other days (tried PIRL, ELLA, ETN)
So far I made 4 times my investment in just over 5 months... ETH and alt prices keep going up so dont worry about the current price