King MFD-150 vs. MFD-250

I've pretty much narrowed down my multi-function display to one of these two
models (King MDF-150 and MFD-250).

I'd love to hear any comments and/or preferences regarding these.

The 150 has a larger screen but the 250 has a relative terrain mapping
feature (terrain is colored according to your current altitude). They both
interface to a WX-500 Stormscope and have internal GPS, as well as
connecting to my external one (Apollo GX-55).

Price seems to be quite close and while the 150 has the larger screen, the
250 will interface to radar and tcas systems (which I don't currently have).

Thanks for any thoughts,

CGP.