While I plan to get a CPL soon, OC allows for easier carry of full sized firearms. Is it possible to CC a 6" revolver? yes, but it's easier to carry said wheel gun out in the open. Much more comfy.
I don't want to carry my Hi Point .45 concealed, way too bulky and would print like crazy. Also heavy. My S&W 469 I can carry either way. I'll opt for more CC when I get my permit, but for now, OC is my only legal carry option.
Tactically speaking, OC has it's pros and cons. Sure, one might assume you're a LEO, but some might take your OC as a challenge to prove themselves.
Still, there are a lot of myths as to being the first one targeted, or having your OC piece as a deterent. Either may be true, I just haven't seen enough data either way to formulate an educated opinion. For me, I exersize some common sense when I carry.