ECAC is not the best conference in the world, and I probably wouldn't want my prospects to go to any team besides Harvard, but Harvard specifically has a good amount of resources invested in making their hockey program top notch.
UConn plays in the Hockey East, which some say is the toughest conference (personally, I would take the Big 10 and possibly even the NCHC over Hockey East, but they do have good teams), but they don't play them much more often than Harvard, and they don't have a ton of resources or a proven track record of producing NHL talent. Playing in a good conference is one thing, but you also need to play on a good team. I wouldn't want many of my guys to go to the University of Vermont right now despite being in the Hockey East.
The main positive is that I expect him to compete for a top 6 job from the beginning, just like Miettinen in St. Cloud State. Connecticut doesn't have much in terms of top 6 forward talent, and even less when it comes to centers.