Definite marbling differences. I find the steaks are FAR more tender than choice and prime. I do not find glaring differences in waygu briskets. They look different, but after a long cook, they all eat well. Some swear by them though.
There is a butcher in McKinney TX that cuts waygu chuck roasts into steaks for 11.99/lb. you cook them a tad longer than you would a ribeye or strip, but then you can cut it with a fork. Absolutely incredible.
So like I said, big difference with the steaks in my opinion.
Custom 30"X84" competition-style RF trailer smoker
Pecos 20"X60" OS by Old Country BBQ
Char Griller 5050 with side box
Baby Arm BBQ