I don't feel either one would be that good.

From what I have heard, the delta wing is going to be a handful for you. Perhaps something along the lines of a Patriot or Kougar would be more appropriate. They are swept wing and, at least with the Patriot, VERY responsive and fast. This might be more appropriate so as to get you used to a faster and more responsive plane.

IF you have to go with what you have, do the Northstar, it should be the easier of the two to fly.