I have the GO, Studio, Westminster and for me best is the Studio, than the Westminster and GO is just so-so to me but well worth it if you plan to carry it to meets and such.
Realize that although we are told that other brand dies will work in Big Shot and such you have to be careful about it. I have ruined a few GO dies using the Westminster. I suppose the same could happen if used in the Studio. You do need to learn to sandwich the right medium boards, plastics whatever when cutting and do not cut more than recommended amount of fabric.
As for fabric waste it is only there if you don't prep your fabric to cut to the edge of the template you have. If you mark your dies with a highlighter it will show you how close to place your fabric so as to not have waste.