I'm far from an expert on either Bavli or Yerushalmi. But, I'm curious as to why yeshivot (and, to an extent, even individual adults learning by themselves, chevruta or via shiurim) study Bavli far more than Yerushalmi. Come to think of it, I'm unaware that there is a Yerushalmi "Daf Yomi cycle" similar to the one established by the Agudah for the Bavli.
Why is Bavli given more importance? Maybe this is "historical"?