I had plans to buy a mining rig but some people confirmed that ETH will eventually go POS and since I'm not aware of any other good coins, I want to see what other options do I have? Is NEO a good alternative? If yes, I'd appreciate some calculations (x bought = x earned for example).
You can buy a mining rig, because not only one ethereum can be mining on it, there are many other coins that can be mining. For example: Ethereum classic, electroneum