They are both oil-free, fragrance-free, and both contain the same amount of AHA (10%).
Neither is particuarly better. It just depends on your skin's needs.
The creme is obviously more moisturizing, but still not heavy. The gel contains sea kelp extract, which is pore clogging to some people, but the creme contains stearic acid, which is also pore clogging to some people.
I've used both with no problems, and I'm acne prone. It just depends on the person. It's a matter of trial and error.