I wouldn't judge a school based on what you can find online. even from what i hear from other candidates, most people consider the most established and best DO schools are KCU, michigan state, midwestern (Chicago / AZ), and PCOM Philly. not saying marian is a bad school, marian is great. however in terms of establishment, KCU has a longer history. again, it depends on what the OP wants. population size may not matter to someone as it does to you. i'm from the inner city of chicago having a couple million people but when i attend med school i dont care what city / town im in as long as im not in a town of 100 people.
OP, consider every factor that's important to you: school establishment, opportunities, history, learning styles, city population, proximity to home, scholarships, cost/tuition, research opps, etc. make a pros and cons list if you have to.