My answer is Litecoin,Litecoin - Stability, closely linked to Bitcoin,. I like this coin, It is also easy to mine and quite effortless.
So what coin are you mining and why?
None at the moment, but I've decided to buy crypto and hold. Mining is a bit more bothersome, needs babysitting, and things can break down. If you buy and hold coin, or even do a lazy trade here and there, you'll still get a good return, and no need to babysit anything.
I'd say a smart guy would probably do both. Invest in alt coins, and mine some stuff as well. Never hurt to diversify.