Since you asked, I'll give my 2 cents. (Pardon spamming the Dash thread here but I'll try to stay brief).
1. Lisk is a total wildcard. On the one hand, making blockchain apps easier to write via Javascript could be huge for attracting talented developers. OTOH, they are using delegated proof of stake (DPoS), which is crap because it promotes an incestuous insiders club. Delegate #101 gets a full subsidy with his 100 other buddies. Delegate #102 gets a big fat zero.
 
2. Waves has great potential and I think Sasha will deliver everything promised. But, the question is, will it matter?  To what extent can it attract end users? How to foment the 'animal spirits' that compel long term investors, developers, and users to action? I'm afraid, due to it being a pure proof of stake system, with all coins already out with no long term subsidy, it may follow the same rise and fall as NXT.

3.  Decred. I'm still learning about this one. On the plus side, lots of effort has gone into making Decred a full DAO. I do like that it's mineable. I do like that they have a hybrid PoW/PoS system somewhat similar to DASH. I don't like the fact that 10% of the mining subsidy goes to a centralized foundation, "Decred Holdings Group, LLC (DHG), a Nevis-based organization" according to their wiki. They need to fix this and make passing proposals payable to developers directly from the blockchain.

4.  ETH. Where the party's at, apparently. I think they are making a mistake to move PoW operations to PoS. Once again, moving from 'wild mining', as camosoul puts it, exclusively to an insider's club of staking whales, is a fast way to kill a lot of interest in your economy.  DASH has a little bit of the 'staking whale' problem too (where whales receive more coins which lets them setup more masternodes to receive more coins), but the concentration is less because 55% of the subsidy goes elsewhere i.e. to miners and developers.