I do not mine, honestly.
but, if I were engaged in this, then surely I would mine the ethereum.
Bitcoin, of course, cannot be mined now on video cards, but I think it is worth mining the second most capitalized coin.
Moreover, the price is now growing and in the near future, it seems to be worth very well. Furthermore, ether is the least volatile of all altcoins, and the most liquid.
It is already clear that the Ethereum is like Google in the world of cryptocurrencies.