I'm also in OH, but in the Cleveland area. (Yeah yeah, I know, condolences aren't really necessary.) I grow mine in pots for the reasons already given. Our grow season is so short here, there is no way I could get any production from peppers like 7 Pot, Brain Strain, Fatalii, or Rocoto if I couldn't start them in the house and/or bring them back in the house when the weather cools down. Similarly, I can move them into the garage if we get too-strong winds or hail. This year I will be doing a mix - some in the ground and some in pots, with at least one of each variety in pots. I also agree that you CAN control the soil in an in-ground garden - I hired someone to dig out my garden area, and had him bring in a good soil mix to fill it. The plants in the garden appear to be very happy with that, and they can stretch their legs as long as they wish.
So really it's up to you, given your local factors, what you want to grow, and how much control you want over mobility. If I was only interested in growing annuums, for example, I might do them all in the ground since they grow and produce pretty quickly.