Netflix is still better than renting from a store but, Blockbuster has leveraged their existing stores into a better deal on-line.   

If you want the best on-line option it would be Netflix.

If you want the best overall package it would be Blockbuster's on-line. They have combined free monthly movie/game coupons, good customer service and spur of the moment opportunity to get a new movie the same day.

Taking a movie to the Blockbuster store after you just finished watching it and choosing a new one during that trip is simply the leveraged advantage of having stores.

They will mail the movie...