I don't prefer the other model
NewTrent 10W dual USB is also BOGO. Still looking on why the 10W has a higher MSRP than the 15W.
15W model has a 1A and a 2A outlet; 10W model doesn't say if you can even put all 2A into a single outlet, or if it's just two 1A outlets.
You're right, it's ambiguous, whereas the capabilities of the model in the OP is clear. The higher MSRP may be because it's an older model.