I find they all have their pros and cons depending on what you are looking for. Coburg is a little quieter, it has a lot more cafes than bars, but it's still really convenient to everything, and tends to be slightly cheaper.
Brunswick East has the bonus of being close to Lygon street, with amazing food, and also close to Nicholson St with the 96 Tram to St Kilda.
Brunswick has great shopping and food.
All three are great multicultural communities with a focus on community. Moreland in general has a great and welcoming culture, I'm sure you will be happy no matter where you end up. Feel free to contact me if you are still looking for a place.