In the early years, an RV3 and a MM would have been a wash to build. They both would have been scratch. Under that one reason, I would pick the MM. RV today is a whole different animal. Coming to flying and probably cockpit space, an RV3 is probably a Cadillac. When sitting in the cockpit, you don’t notice the wings or the paint job; you notice flying. That is where VanG won the race. Most of the style that you can fit in and don’t need to be an astronaut to fly. The details can be washed away. I had a friend with two RV3s. His and his wife’s. That’s how they traveled. He did not build either, but his had a turtle deck not a bubble. It was pretty cool. The other was a better made plane, but not as cool.