To me the chain with the lower operational cost (all other things being equal) is better. And that chain is the one that is more efficient.
Amazing how people STILL, after 10 pages of the thread, are missing the point of
the article in the OP.
There is no "lower" operational costs regardless of the security model!
Security costs will always rise to the level of the rewards being
given, due to competition.
erm.. Actually no.. How do security costs rise in a pos system when rewards are tx fees? Did security costs rise for nxt when the asset exchange came out and transactional fees doubled or quadrupled and in turn rewards doubled or quadrupled? No they didn't so your theory that securty costs rise as rewards rise is wrong..