On the topic at hand, I'll have to think about that one, I have quite a few that I like
When you, ya know, MAKE YOUR OWN, I'm sure you have plenty of favorites!
Honestly, my MA SpaceGodzilla and Y-MSF Megalon. SpaceGodzilla is just amazing, I can't praise it enough. Megalon is really cool, one of my favorite monsters. The Y-MSF feels a bit weird, but the details are really great, and the paint job is really good, except for one spot on the head, but it gives him a more realistic look to him.