ATI vs Yamaha

Has anyone had experience with both ATI and Yamaha vintage amps?

I currently own a Yamaha M40, but would like to know how it compares to an ATI amp like the 1502.

Any opinions appreciated.
nobody knows?
Sorry, no experience with Yamaha gear. I'm a fan of ATI based on their AT602.
Love my ATI 1506.

No experience with Yami.