I think you are asking a subjective and almost impossible to answer question. Frame descriptions are largely marketing, and give almost no meaningful information. Listing different grades of carbon is less meaningful, because without knowing amount used and where, it doesn't specifically help. Rider weight and subjective feedback will be different, so the only comparison that matters is your own. Ride them all if you can, and answer the question yourself.

I had a BMC SL02 that did not impress me as far as stiffness, where others will rave about it.

Good luck.