Why?

Here's the article. The difference is probably due to intake design, and not carb/EFI.
http://www.hotrod.com/techarticles/engine/hrdp_0909_gm_ls_engine_cam_test/viewall.html
My point is posting this is not to say that a carb or EFI is superior to the other. But that for someone to say the use of one is a bad choice under all circumstances is just stupid and ignorant.

I prefer EFI. The tunability is what I like the most. Changes to the tune are immediate and calculated.