While the regular version had a biting, acidic feel, the natural felt smoother and more mellow. The regular mouthfeel was inferior, being somewhat astringent. There was a grittiness on my tounge and teeth with the regular version that seemed absent with the other. Overall, the taste profile was very similar. I think that the natural version had hints of cognac, but even in the non-blind test the two drinks were difficult to distinguish. Later, a couple of my friends also used the adjective “smoother” when describing Pepsi Natural versus regular Pepsi.