If you want this to be a long term rental, I would recommend you focus your search more on the long term rentability of the space than on which neighborhood will appreciate more. You may likely find that your two options for purchase in Chinatown/Northern Liberties cost about the same, but a two bedroom apartment could rent for 150-300 more per month than a one bedroom in 2 years when you move out. I usually use Zillow for finding the average going rates for rent in an area, but any real estate agent could also help get you the figures.
I would love to talk with you more about this and send you some examples of deals that fit what you are looking for in these two areas. I also would love to help you get a plan together moving forward so you don't miss out on another deal