CVS or Walgreens?  Which is your favorite?  What makes you choose one over the other?

A few days ago I presented the question, "Walmart or Target".  Surprisingly, of all who chimed in, it was almost 50/50.  What was most surprising about the responses was the unusual amount of people who said they don't and won't shop at either.

So what about CVS and Walgreens?  It's kinda the same situation as Walmart or Target.  CVS and Walgreens mimic each other in terms of products on the shelves.  And they are very close in pricing.  Each have nice weekly sales.  And both have their own cheaper brands of drugs over the name brands.

So why do you choose one over the other?  Is is brightness of the store, the greeter at the door, pricing, what is it?  CVS or Walgreens, which is your favorite and why?