Should I Mine More Than 1 Coin?

[Doranile432]

Mining two coins at once is a very bad idea today, automatically you will get lower reward because you will be putting more stress on the GPU and getting lower reward in return, total waste of time and electricity

[FatFork]

I don't really know about mining, but I think it's better to focus on 1 coin so that the results obtained are more satisfying. apart from that, I think ethereum is currently the best coin for mining. split some rigs, or hash power will only make your income decreases.

I agree with this. Split mining will only reduce profits. Concentrate on just one coin that currently brings you max profits or that you believe will be the most valuable in the future.
Otherwise, you'll only overload your hardware and spend more on electricity.

[nicedreams]

Yes, there is cross mining between different coins to maximize your profit. Tho you need to be careful on the calculator to make sure you're not compromising your main-coin setup. I think you should head over mining sub-forum in Bitcointalk to learn more.