I don't own the Aadland set, but I have heard most of it. I do own the Engeset and Ruud sets. The truth is, Grieg's orchestral music with very few exceptions (Tveitt's orchestration of the Ballade; the Symphony in C minor) is so straightforwardly attractive and so gratifying for the performers that there are few, if any, bad performances. All three cycles are, on the whole, enthusiastic and vividly colorful, and if I occasionally do have a particular favorite (e.g. Engeset's Old Norwegian Romance), it's not really reason to throw the rival recordings away.
There's a lot of overlooked stuff you'll love, like Landkjenning. One comment - Schuch's piano concerto is more of the slow, "integrity" (i.e. less flashy) style of pianism. I do like having Andsnes and/or Gimse for a more extrovert contrast.