doesnt NXT have a POS algo that already works? why not fork nxt to adopt everything they have in their system and modify it with your algo?
i feel every coin is trying to do similar things while we see that the one major coin has much of these "wants" tackled. why waste time making your own from scratch when you can just fork nxt and you'll have almost everything u wanted and call it your own coin. then maybe focus on working on more innovative stuff than reinventing the wheel. my 2 cents.
Guess we'll have to write some more to compare with existing PoS algorithms. But for now, please have a look at the "Infeasibility of Private-Chain Attack" section of our white paper, there's a discussion that why PoS must NOT compare with infinite long branches.
About decentralization:
PeerCoin has a centralized checkpoint broadcasting mechanism(
ref);
Nxt has a hard coded chain switch limitation (720,
ref) to prevent private chain attack which sacrifices decentralization. Here's a
great article about this matter(section 4.3, Long-Range versus Short-Range Attacks).