Best steakhouse lower westchester?

Best way to find an answer to your query about the quality of the beef is to ask them directly. I often enjoy seeing their faces cringe when they answer. If you are avoiding the other high-end groups as you say, you might also want to check out Gabriele’s Italian Steak House in Greenwich. But be mindful of sky-high prices going in.
As an aside, you just might find what you want at Alex’s Bar & Grille in North White Plains. They are related to the Blackstone group and their steaks are quite good and less expensive.