I invested in curecoin and then found out about gridcoin. Both are "help the medical world" coins. Which one has better LONG term prospects and why? Are there other coins in this sphere?
It depends whether Gridcoin plans on rebooting again and confiscating any coins that aren't burned, again. Yeah, I missed out on this and lost a bunch of GRC that I'd mined back in 2014. Just something to be wary of.
http://wiki.gridcoin.us/Gridcoin-Classic- Former Gridcoin holder, now empty bagholder.
On one hand, the burn period was 6 months long during a switch from proof of work to proof of stake, it was pretty difficult not to know it was going on.
On the other, lessons learned - proof of burn should be performed via snapshot & import wallet sharedrop method (like BTS).
There will be no such transition again though, so you should get crunching again using the pool.
I've been looking into proof of burn on Gridcoin to project rain custom assets onto Gridcoin users:
https://cryptocointalk.com/topic/44611-monitoring-selfburn-addresses-for-custom-beacons/