I have seen feedstock folks chase $B and ignore feet, milk, inputs, $EN, fertility, etc. I have seen folks go after marbling and forget feet (big time), fertility, etc. I have seen folks going for bigger numbers across the board and do it through frame, frame, frame. Huge cattle that are again, not focused on feet, longevity, fertility and for sure not focused on DMI or any kind of conservative feed program.
I would suggest the Tyson and JBS and Cargill want you to focus on carcass above all else. Nothing else affects their bottom line like grade.
We have also seen more moderation lately. More blends of bulls having good marbling scores, ok to good ribeye size and still be putting females on the ground thar you want to keep. Hoover dam used to do it. Impression used to do it.
We will be rotating our sires to capture 3/4 feet, fertility, longevity, big rears, lots of muscle, and efficient uses of their feed inputs. 1/4 we will focus on carcass.
Go do the sire selector on angus.org. it can help you narrow some things down and then call some folks or get on here and ask for reports and experiences. We all share in a fairly humble manner. Well, most of us anyway.