Blockbuster has a better deal for the RRR (rent-rip-return) people.
You can get unlimited IN-STORE monthly fee rentals, 1 movie at a time. No waiting for the DVDs to go back & forth through the mail. No questions asked when I rented a movie & returned it to rent another less than 30 minutes later.
Also, using this plan, complete box sets count as 1 movie, so you make only 1 trip for them.
I am on Netflix as well, joined both like 2 months ago, and already it has gotten noticably slower. There is sometimes a 2 day delay between the e-mails from Netflix receiving when they get my returns, and the e-mails from Netflix shipping when they send the next items in the queue. Sometimes the e-mails suggest that videos I returned together arrived at Netflix a day apart. And it takes 3 days for them to "receive" a movie normally. On the plus side, I consistently get the movies the day after they ship, which is 1 day before the "Est. Arrival" date.
Blockbuster in-store plan is definately better in terms of the # of movies you can rent in a given timeframe, but Netflix has a much better selection and is much easier to find stuff than my local blockbuster. The local blockbuster selection is just plain BAD unless you are looking for new releases. I mean who the heck wastes shelf space with copies of Gigli, and doesn't carry The Predator?!
Also, I should add, Netflix is probably better for your DVD player. Blockbuster DVDs always take longer to read because of the amount of dirt & scratches.