For a few months, Me and a friend are mining bitcoin and litecoin, without focusing on other currencies.
Only now we realized that we had to invest a little more, for example on ethereum.
Ethereum in recent months is growing scary, so we decided to invest!
In some time I'll let you know if we made a good choice:)
One thing you have to consider is that ethereum will be launching Casper. No definitive date was given. But once launched, small scale mining will essentially be dead as ethereum moves from PoW to PoS.
Thanks for your advice!