It really depends. May SEOs proclaim that “content is king” or long form content always wins.
In general, that can be misleading. On average, content that’s longer tends to rank better, but correlation is not causation. The general sentiment in the SEO community is that long form content simply allows the author to cover the topic in more depth, and allows more room to include keywords and other relevancy signals.
One of the things we do when evaluating your competitors, is seeing how much content they have, and using that to generally determine how much we should be aiming for to include the right signals, as stated above.