I've been looking at cryptocurrencies that add (more) value to society through their proof of work/stake mechanisms. Currently I found FoldingCoin[0] and CureCoin[1], but I cant seem to work out what the difference between the two is.

Is one of these particularly better?

Are there other likeminded currencies that are easily mined?

There's also SolarCoin[2], however it requires installing solar panels to mine.

[0] https://foldingcoin.net/

[1] https://curecoin.net/

[2] https://solarcoin.org/