There is no best cut from a health perspective. Over 90% of the beef in the US is GMO corn-fed contributing to heart disease, obesity and a myriad of health problems. Even when you pay double and opt for grass-fed beef, it's still never 100% grass-fed as grass is typically not available in winter in most of the US, so soy is substituted. Soy products today are a biological genetic abomination, as is wheat, BTW.
Even if none of these issues existed, there remains another major problem with beef consumption, which is shared by all dietary animal products. Of the rogue, health threatening pharmaceuticals, hormones, antibiotics and industrial chemicals in the human body, the agricultural chemicals, the environmental pollutants etc .... the overwhelming majority got there by the consumption of animal products. Livestock in the USA in particular, is a polluted, chemical laden nightmare. The FDA and the USDA are bought and paid for, ineffective shams, .... just puppets on a string at the whim of the big food industry. They don't give a fuck about your health. Why else would they allow literally hundreds of food additives and chemicals that are banned elsewhere? You must educate and look out for your own health and the health of your family.
If you're wise you'll limit your indulgence in animal products of any kind to a rarity, if ever! This, minus the exception of sardines, and Alaskan wild caught salmon. No other salmon will suffice! No other seafood will suffice due to mercury levels, and/or a limited bioavailability of life and health preserving Omega three fatty acids. (not to be confused with Omega six, which is not generally your friend, but still required in LIMITED amounts)
Your eggs, ...... spend the extra 2 or 3 dollars a dozen and opt for pasture raised eggs, if you consume them at all. I didn't say "cage-free" or any other meaningless term... the carton should say "pasture raised". At least three times the heart protecting, and health boosting nourishment when compared to the typical cheap grocery store eggs. Generic eggs in the US, alone, are particularly NASTY! Have you maybe noticed that eggs aren't refrigerated in most of the world except in the US? That's because the products of the egg industry are so incredibly nasty and chicken shit coated they have to be scrubbed and sanitized in order to be sold thus destroying the protective cuticle membrane. Clean, healthy eggs required no refrigeration! There are good reasons why the lifetime cancer rate in the US was 3% a hundred years ago, and is now roughly 50%. Why the US remains in the top tier of fattest countries in the world. Why the US leads among type 2 diabetes rates. Why damn near half the adult population in the US is on anti-hypertensives (120 MILLION!). Fuck them steaks.