Having owned both, I can say it is an easy choice for me. I really enjoy the freedom to customize the plane the way I want it and to select components and parts from any source where it makes sense. Experimental avionics are reasonably priced and have advanced features. If something needs to be worked on, I just take care of it, and can be back in the air on my schedule. Insurance rates for like aircraft are comparable with type certificated planes (at least mine is).
Don't get me wrong, I'd be happy owning ANY airplane. It is just that the liberty that comes with Experimental makes it the better choice for me.
May I suggest that instead of comparing total cost, it makes more sense to compare total value. Value comparisons are more subjective, but I think more accurately represent what is received in return. For instance, flying a new experimental plane instead of a 50 year old TC plane is of value to me because I'm flying a new plane for 1/3 of the capital cost of a new TC plane. Ownership costs for everything except maintenance are comparable, mostly. (I run car gas, but could in the right TC plane, too). I can better control maintenance quality and costs by being experimental.
So I'm flying a new plane, that is built with the best quality components available, that is maintained to a high standard, that has advanced avionics, that I know inside and out, that has the mechanic along on every flight, and that has the performance and handling characteristics I most desire. To me that adds up to a lot of value for the investment made and that is why, for me at least, experimental aircraft ownership makes a lot of sense.
Mike