For my LCP I have three different holster and carry methods: inside front pants pocket, IWB(deep conceal holster) and OWB. My LCP is mostly carried in my front pants pocket; meaning that the other $100 in holsters for the LCP sit mainly gathering dust.
If you are like many of us here, and continue to own carry guns, you will soon find yourself with an entire holster drawer; drawer filled with holsters.
Having handled, but not purchased, the LC9 I would think that either IWB or OWB would be the mode of carry. I think that it is a bit too large for easy pocket carry. Personally I would start with OWB at about 3:30 - 4 and go from there.
YMMV