Whether or not something "makes sense" is a poor indicator of its truthfulness. JW theology makes sense in a circular way, as long as you don't mind the fact that it cannot be tested. All sorts of pseudoscience makes sense to those who believe in it. Quantum mechanics on the other hand, does not make sense, but it is nevertheless something that can be tested and verified to be true (in so much as anything can be).
In favour of Buddhism is the fact that they have been practicing meditation for a long time, and have become quite good at it. There are elements of Buddhist philosophy and practice that probably have great value. But adopting a world view comes with the danger of filtering everything through that world view, rather than based on what can be observed, tested, and verified.
I would wager that Buddhism is probably generally less harmful than JWism though!