Atlas V had a "partial failure" where the second stage cut off 4 seconds early in a 900 second burn; but even the customer (NRO) still called it a success. If Falcon 9's aborted secondary payload doesn't count as a failure then I can hardly see how Atlas' slightly lower orbit does, which means it's at 54 successful launches and counting.
Delta IV-M on the other hand has never had even a partial failure, 21 launches going. The Delta IV-H had one partial failure but that's a rather different animal.
Also neither vehicle has ever had a total failure.