Bitcoin - Although the technology is outdated and they face some issues it is something to be the first to the market
Steem - changing the social media game!
ETH - Vitalik is a guru. enough said.
Factom - the data security and ability to safeguard data.
Gridcoin - The fact that excess computer power runs it awesome! I sold a 1/3rd little early today. Hoping to buy back in once it comes down!