Quote from TormodIts a subjective question.
I like complex decision trees, therefore Legacy is a better format for me. So lets make it a specific conditional sentence.
Legacy is the better format for people that like a more complex game.
So lets just leave it at that.
That bolded statement is only true if you are not also trying to imply its converse: "Modern is the better format for people that like a less complex game". Because that is not quite accurate. There are lots of reasons for players to enter one format over another. For one, Modern and Legacy gameplay is not mutually exclusive, even if some posters here suggest that it is. One can play both formats for different reasons.
But there are some reasons to play Modern that might be comparatively more attractive to players than just complexity. Although I enjoy a complex game, I would rather try and work with a brand new format that is relatively uncharted. The brewing and deckbuilding challenges of such a format are, at least theoretically, more interesting to me than the gameplay complexities of Legacy. That is not to say that Legacy deckbuilding lacks complexity; far from it. It is only to say that in any new format, whether Legacy at its infancy, Extended after a rotation, or Modern today, there are exciting new deck creation and combo challenges that are just not present in a more "established" metagame. This is just one example, although we could find others if we wanted to.
Too often the Modern vs. Legacy debate becomes one of wrong vs. right or simplicity vs. complexity. Personal preferences are much more complicated than that, and the conversation needs to reflect that.
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I can corroborate that since I'm one of the new guys who came yesterday. Glad to have met you WorstBandNameEver.