Bake what do you use?
Blockbuster... in addition to all the benefits offered by Netflix there's the added incentive of instead of dropping the movie in the mail when you're done, you take it into the Blockbuster store, where they immediately catalog it as being 'returned' (meaning they can ship another movie quicker instead of waiting for the movie to reach the warehouse), and plus you get a free rental from the store for each returned movie.
The plan I have caps the free in-store rentals at 5 movies per month....on top of the three out at a time by mail, but I believe the higher-tiered plans offer unlimited in-store rentals.
I stopped using Netflix about 4 yrs ago...too much BS with delays in mailing. They eventually got sued in a class-action suit and settled (the claim being that they artificially limited the number of movies one could watch per month by slowing down the turn-around times by mail). Now magically they've resolved the issue...yeah right
One advantage I've seen with Netflix is that their library (somewhat surprisingly) appears to be more extensive than Blockbuster's...every so often I'll punch up a movie and Blockbuster won't have it among the offered listings. Don't think I ever really encountered that with Netflix.