Any place that has ingredient information available, so I know I won't get sick from my food.
As far as chains go, Pizzeria Uno is good, as is PF Chang's. Uno's has their entire menu online with ingredient lists as well as nutritional info, and PF Chang's actually has the staff trained to ask, before you order, if anyone in the party has food allergies they need to be aware of.
My food allergies really limit what restaurants I can enjoy.