n0 > what do both bring to the table?
right, I think this the right question.
YV is definitely better at producing large families and large number of cheder teachers, and keeping young people away from trouble. MO is better at producing people with balanced lifestyle that integrate Torah into normal life, being able to apply Torah concepts to finding time to learn, doing business and paying taxes, and relating to the world knowledge.
In terms of best Teachers in the higher sense of this world, then I find people who combine both approaches are the most successful. This include either more “modern” Rabbis, like R Soloveichik [who actually says that Jewish community is organized around a Teacher, not around political party], who at the same time have solid learning, or more traditional Rabbis who to some degree interacted with the modern world, such as Lubavitcher Rebbe. I find similar characteristics in Teachers I meet personally – they are either Modern with solid yeshivish background or Yeshivish who experienced modern world in some way.