Best fit off the rack for me is Kamakura slimfit OCBD; still Uniqlo's are great considering the price even after tailoring. No experience with CM. I will also say Uniqlo's are no worse fitting than BBBF which i still had to get tailored and those aren't cheap. My default for work is Uniqlo currently; will give CM a try.
BBBF and Kamakura does use better quality fabric though, i prefer their cloth.