Comparing Whedon and Snyder's version is basically comparing apples to oranges. The directors had two different visions, even if parts of Whedon's Justice League felt like he was trying to replicate known Snyder hallmarks. I mean, the opening to the original Justice League is reminiscent of Snyder's Watchmen. Snyder finally got to see his vision through to the end and nearly every creative decision made was for the benefit of the production.
Even the actors seem to be more enthused in his version as opposed to the reshoots used for Whedon's. I can't exactly blame them after seeing how basically everyone's storylines were fleshed-out in the Snyder cut. Snyder also cares for the characters in a way that was absent from the original, with great care and detail going into each's realization. Beyond that, movies are just better when you know that there's a passion and fire behind the project from everyone involved.
Snyder stepped down as director during the original production of Justice League after his daughter Autumn died by suicide. He then dedicated the 2021 version to her with a card prior to the credits stating, "For Autumn."
