Ordinarily I would agree, but in this case, the poster said that there's not a lot of data yet so it would be easier to migrate. Choosing a database is a pretty major decision with long-term impact that might not be obvious now, so it's worth exploring a few options if you have that luxury.

I think there are two times when it makes sense to consider a DB migration: (1) early on, when it's easy; (2) if you are in major trouble with your existing DB.