i have owned both i like the cm9 it is smaller and much lighter it makes conceal carry much easier
Are you comparing the CM9 with the PM9?
If so, they are the same size and weight. The only slight difference is that the PM9 has a 3.1" bbl. and the CM9 has a 3.0" bbl.
Both are 14 oz. empty and the magazine is an additional 1.9 oz.