Rite Aid is more convenient for me, but since I discovered Walgreen's Monthly Supersaver books, I'm all over them. I'm a whore for savings.
I got $20 back for September, $7 for October.
I loathe Eckerd, they're too expensive & they'r always out of whatever sale item I'm looking for. CVS has a shopper's card, which pisses me off, so I don't go there. Ever.