Homie, you're thinking about it in the entirely wrong way. You don't mine that one crypto that can make you cash now, it's a losing game. Even if you've got a Petahash of hashrates for BTC, to increase your hashrate with the difficulty, just to keep earning the same amount... It's guaranteed to lose all your money. Use whatever power you've got, but look into the different coins. How long have they been out, what's the network hashrate like? Does their announce thread have a lot of hits in a short period of time, or not much hits or replies but has been out 3 months? Do the devs stay active in threads where the coin is being talked about? Do any of them have a history in cryptos, and have they made previous Cryptos? How did they do, good and bad? Have they learned from their mistakes? Is there reports of fraudulent behaviour?
Base the coins you choose to mine on things like those examples. Pick a coin that looks like it's been looked over, and has a lot of support and promise in its future. People need to be rich in order to successfully mine bitcoins, and to efficiently profit, not talking about $0.70/day. The people that got rich off of bitcoin were the ones that thought they wouldn't mind sparing a bit of hashrate for this useless software hashing thing for fake "coins", or they heard about it, and when reading online, realized that they could buy like a few thousand for a few dollars and thought they were going to just piss their money away. Turns out it finally paid off for the people that just held it for fun, or invested a few bucks in it. It's unfortunate though, that a lot of people seemed to sell those coins that they bought for $0.00004 a piece for $10 each when it reached that, thinking they were the smartest people alive to have got out when they did. But then when it reached around $500, or even that one time it had hit $1200, well, people were just kicking themselves for it.

Personally, I'm always mining for different algos, whatever looks interesting. Some die before I can get on the exchange, however that just indicates that they were created by the devs for a cheap and easy way to get quick money. Charge people for