At the time of publication, having 1 MSol/s for a day based on What To Mine yielded around 62.5 ZCL (it is currently more like 58 ZCL) and nicehash was about 0.5647 BTC/MSol/s/day, so if you mined for a day, it would cost 0.5647 BTC and would yield about 62.5 ZCL (now 58 ZCL). CoinMarketCap says ZCL is 0.01194290 BTC so if you did a pure exchange of 0.5647 BTC you would get 47.3 ZCL, and 58 ZCL/47.3 ZCL is 1.22 or 122% leading to the number of about 20% more ZCL obtained using nicehash than using an exchange.