From a real-world perspective as a viewer, I think Q was created and written as a foil for Picard, the actors had awesome chemistry, and their TNG stories generally worked really well. On the other hand, as much as I really love Voyager, Q seemed awkwardly shoehorned into it for the sake of doing Q stuff and it really shows. The chemistry with the characters and actors is lacking, the fundamentals of the stories feel way off, and it all just doesn’t work as well.

While I generally rank TNG’s Q episodes near the top of that series, I tend to put VOY’s Q episodes near the bottom.