Gridcoin (GRC) is in my opintion the best coin to support as supporting it involves supporting sciene and advancing humanity. The best thing about it is that even total crypto-newcomers understand the idea behind it and want to contribute their computing power, see for example
https://www.reddit.com/r/homelab/comments/3k059i/run_boinc_on_your_home_lab_offset_electricity/The mining process consits of running BOINC (
https://de.wikipedia.org/wiki/Berkeley_Open_Infrastructure_for_Network_Computing) research simulations on your computer, for example folding proteins, simulating a brain or searching for aliens.
You get rewarded for this research in a completely decentralized way. If you are interested go to gridcoin.us or visit our IRC:
https://kiwiirc.com/client/irc.freenode.net:6667/#gridcoin