I don't know which argument is more constructive, though? Both teams reported what they did. They got different results. Figuring out why is the next step, and

I don't know which argument is more constructive, though? Both teams reported what they did. They got different results. Figuring out why is the next step, and pointing out that they did different things seems useful. Though, the broader question is how useful the results of the original paper are to other people who might do the same thing.