Ethereum : impractical idea - no practical use cases
Ripple: outdated model - limited appeal
Mastercoin+ Counterparty: unsuitable foundation - limited functionality
Invictus Bitshare : fragmented products, lack a correct vision
Exo: dubious fundamental
Bitcoin: still great but the old King with new problem popping up everyday
NXT: XXXXXX
NEM: the 2015 King - best developers- best innovation - best vision - best community

Disclaimer: comments are with guaranteed objectivity.