Can't say cvs vs Walgreens but I have had excellent service from Walgreens. Both the Texas and Minnesota Walgreens has been good and I very much enjoy their online services. They notify me when it's time for a refill and email when ready for pick up. The only problems I had was back when I was on heavy pain meds they didn't keep them in stock and those are not refillable I'd have to get the script every month from the doc and drop it off at Walgreens and then go back later to get it. No longer on pain meds so it's all good again.