3) mining - now here you will say that if I have money i should buy my own mining equipment and mine btc myself, but my arguments stay - it is way easier and better for me to mine btc via cloud mining services, than to buy equipment i have no idea how to take care of, where to buy, what kind to buy, how much to pay for, what to do if it breaks, etc. I don't have a place to place a miner and i have heard sounds that it produces, i can not bare that! So.. i preferred cloud mining! Mining is the best choice for me, because if I buy a $1000 of hashrates (instead of buying a fixed 0.13 BTC) i will have income in btc. And if you'll say that my potential 0.13 btc will grow as well with the price growth, i will say that from mining my everyday income will also grow.
This is a very interesting point of view, but what is questioned in the investments made in cloud mining is whether or not they are profitable, you can invest 0.13btc for a 2 year contract and at the end of the contract you receive 0.15btc or receive 0.08btc with losses. If you buy an altcoin that has potential, for example buy ETH now and hold for 2 years that you will have many more bitcoins in 2 years.