I use a crock pot once in a while, but there is nothing like the pleasant smell and warmth put out by a nice chicken or roast cooked in the oven...
Well, after our experiment with the chicken, I agree with you - if you want a roast chicken, do it in the oven. But the Instant Pot makes some things wonderfully well, while saving a lot of time.
Get the big oval. It is heavy to handle and wash but if you are strong enough, it is a heavenly tool in the kitchen. Stews, roasts, Cioppino, Bouillabaisse, chowders, gumbo, short ribs, cleans up easily if properly used.