Which Cosmo Marines Tactical Mover: Gamma Airborne Unit or Garuda?

I'm leaving Japan soon, and I already have the normal Garuda, and the Cosmo Marines Hawk and Tread. With my recent purchase of the Horus EX core + armaments from TM-23, which really goes well with the Cosmo Marines frame, I'm really feeling like I need one more TM frame to display the collection.

On Mercari, the Cosmo Marines Gamma and Garuda are kinda the same price. I'm kinda torn which one to get. On one hand I haven't got a Gamma, but it comes with a lot of repeat parts from Tread, and the transformations are not really cool. The Garuda will come with the additional correct tail (since the original is in the wrong color), and I don't mind getting another car, but this will mean I will have another Garuda.