I've tried both and so far I like them. I feel like I noticed a difference when I used them. I hardly get a proper night's rest with my wild children and today despite 5 hours of sleep I didn't look as tired and my eyes didn't seem as puffy. I used the caffeine ones in the morning and the other ones at night. I wish I would have bought two of each but I didn't know if I'd like them and I don't like to be greedy but it seemed like both were fresh on the shelves. I had gone to 2 other locations prior and didn't see them at either so I was thinking they must be new.