ASIC Mining

I don't have experience with ASIC mining myself as I don't have a rig for it, but I could help you out with it a bit.
Mining BTC isn't as profitable anymore as mining altcoins is.

If you're using an ASIC machine, SC (SIA) is a good option and will give you more profit than LTC, and especially BTC.
With GPU mining, I'd just stick to Ethereum.