I don't regularly get frozen pizza, though Red Baron's french bread pizza is good (too bad I have to make special stops to get it, as my regular grocery store no longer sells it). I've had their regular frozen pizza too, and it's pretty good.
For chains, I'll go with Paesan's, which is technically a chain as they have other locations around the Capital District beyond the one I go to in Latham (I've even been to a couple other ones, due to them all having different holiday hours around New Year's). If I'm traveling, I'm fond of service area Sbarro's or Pizza Hut Express where they exist, although if I'm getting dinner at a destination I'll go for somewhere more local.