G1s, to me are the most valuable, the most beautiful and the most desireable. I color-code them, display them in different "scenes" and ensure they look their best.
G2s, as I only have two (they are childhood ponies) are ranked along with my G1s but don't get the spotlight.
G3s have residence on my bookshelf. They are not as worshiped as my G1s so they are not really in my collection area.
G4s, sit on top of a little dresser, along with my more delicate ponies or customs. (Sculpted parts, flutterponies, etc) They are kept in good appearance but not a lot of thought is put into how they are positioned.
The highlights of my collection are my MOC Firefly, my Escape from Catrina animation cel, and my favorite line of G1s (rainbow ponies) they are featured in a display together on one wall. MOC Firefly hangs from a nail, the framed animation cel is below it, and the rainbow ponies stand on top of the very large, fancy frame.