With 1080 Tis better mine ZCash since they are very good there and sell them to buy another crypto-currency if you do not believe in ZCash. Ethereum is for me a great option on short-term.
Yeah, Zcash is by far the best coin to mine with 1080 ti's, yet the future of it worries me..
As I'm in for long term (
HODLing) and am betting on it to grow progressively.
Part of the fun is gambling on a new altcoin as well, I see a lot of people buying waves,
mining OBIQ, decred, siacoin, etc. Getting these for less than a dollar or a cent, hodling
and having great profits in the future.
It depends of which strategy you want to use. You can sell anything as I told you before and buy a crypto-currency of your choice, or maybe several, in which you believe.
You can also sell a part to pay electricity, and let's say sell 30%, 40% or 50% and buy another crypto-currencies in which you believe.