Definitely ETC + Sia better than Zec currently
is SIA worth mining anymore? The electricity cost due to each card pulling 15W more is almost equal to the price of SIA
Depends on your cards, cost of power (varies wildly), and if you can use the heat (in winter), vs cost of say heating with gas or wood.
yeah.. I was using my rigs as heat source in Houston

.. it has been hot as hell winter. I was so hoping to use it. but still I get drop of a 1MH/s each card and get lbry 25MH per card on 4x480. Power consumption goes up by 15-20W and heat goes through the roof. .
And I see some level of instability after mining with cards moving from ETH to Zcash and back.. its just weird that miner works perfectly. but the moment I close the miner the whole system hangs. .