I used NiceHash when I had no time/wish to watch Zcash prices. Since its orders were paid for current Equihash (ZEC/ZCL) prices depending on the market, NiceHash paid in BTC more comparing to mining a particular currency (but took 3% of that in BTC before payment, that's a lot). Its customers watched for better algo, switched to it and paid more in BTC.

I actually hopped between CoinMine and NiceHash because when the payment rate @ NiceHash was high, I mined there and received BTC. When the payment rate was low, I mined @ CoinMine to exchange Zcash later.

I tried and stopped using automatic pools like MiningPoolHub because it does not give you exactly what you expect. It selects an algo for its instant profitability (network difficulty, current price, etc). But after you mine it, it matures, moved to an exchange, things may be quite different. So I preferred NiceHash when it paid well instantly, and CoinMine, when price was low (to sell when it goes high).

Now I left CoinMine, one of reasons is its PPLNS system since Dec 8th. It works bad in such scenario. Never liked PPLNS and always used DwarfPool for ETH. So CoinMine lost my hash rate instead of keeping it, since as said, PPLNS is not good for hoppers, and there is a reason for it as explained above.

I like DwarfPool due to its full stats and ability to talk to operator if you have questions. Every share is logged, so any issue always can be fixed by recalculation. It is small (because it did not enter Zcash race in time). It provided 50% to 30% of Ethereum mining, but only 2-3% of Zcash at the moment. The more people will use it, the less will be variance in payments.

Of course, people already shout here about missing SSL - I've heard it is in progress on DwarfPool. I use it just because I like it as it is.