My dad LOVES Rita's (as do I).
The Italian ice & frozen custard are delicious, so therefore the gelati (Italian ice + custard) is VERY delicious!
Even though I don't live all that close to any of the Rita's (unfortunately), I like this one the best. For one thing, parking is easy (I actually live closet to the one on Mill, but I hate the parking situation over there), and I think it's a little bigger on the inside with more seating compared to the Mill & Arcadia locations.
That being said, I love ALL Rita's, but the little things mentioned above make this one more convenient to go to.