

Mostel,
I have had both together for a week. They are very different watches that have the same output of complications. The 5970 reminds me of the past. Everything about it says vintage or retro. The 5270 screams current and future. After reflecting quite a bit, the 5270 is a great evolution in the line of perp chrono's. If I had to keep only one, I would vote 5270 (again only a week with both). I love both and I am blessed to be able to own both.