Check out this thread I made. The argument many people are making doesn’t seem to make sense to me…
http://www.reddit.com/r/peercoin/comments/2hgxkr/if_peercoin_supporters_make_up_the_majority_of/
As it’s currently designed, NuBits relies on the independent existence of a stable, transferable store of wealth that can represent the value of the NuBits network. Peercoin was designed for exactly this sort of role. Of course right now a majority of people would still prefer USD or EUR for this valuation; however these currencies are not suitable because they cannot be distributed inexpensively in a fair and anonymous way. So unless there is some future discovery of a terminal flaw Peercoin’s design, it’s hard to imagine a scenario where the majority of NuShare holders would prefer another cryptocurrency. Essentially all of the other top 10 contenders were designed to address different problems on the “spending” or “mining” layers. NuBits supplants most of these concerns leaving Peercoin as the ideal store of wealth.