From now on, only the following coins may be mentioned in the thread:


BTC -> classic blockchain coin - POW, store of value.
XMR -> privacy enhanced coin - cryptonote approach
NXT  -> second gen. coin, multi feature coin - Proof of stake
FLT  -> not sure standard first ge. POW coin ?
BBR -> privacy enhanced coin - cryptonote approach
NEM -> second gen. coin, multi feature coin - Proof of importance
XCurrency -> privacy enhanced coin. Xnodes - coinjoin approach
Maidsafe -> unique, not a blockchain based coin, platform
Skycoin -> unique, unsure what it is
Siacoin -> storage coin, similar to company shares


Discussion of the other coins belongs to other threads.