What the heck is MSC and XCP?
Mastercoin and Counterparty, both run on Bitcoin network as their transport blockchain.
Out of those two XCP is a better choice, but neither of the two can compare to NXT.
Bitcoin network is just slow to trade on.
I said it before but I repeat it :
Using 2 blockchains add the possible flaws/risks from both.
If you want a real innovative PoS, go for Nxt.
Don't forget how "fair" was the distribution of NXT.
( I missed the train, yeah, but still a fact. )