Natesan, there were some statistics that came out a couple years ago from USGBC on LEED-NC v2.2 of 350 projects and which credits were most often attempted. However, I don't know if those numbers were published anywhere and if they're still available. If they are, I don't know if the place.
Did you have any specific questions? Maybe I can help.
Also, if you review LEEDuser's recommendations on each of the LEED-NC v2.2 credits, you'll find that we often discuss which credits are harder or less common to achieve, and vice versa.