I'll eat porterhouse or t-bone mostly, but one place near me cuts all the fat of both of those, and the only cut they leave the fat on is rump, so I buy rump when I shop there
Yeah, that's a way more sophisticated question than I'm qualified to answer, lol. I really just add salt, pepper, season-all, maybe lime juice if I have any.
I've tried making marinades and they helped tenderize the meat, but I didn't really notice a taste. I normally use hickory wood when I grill, so that flavor overpowers everything else.
I used to eat ground beef a ton. It started to cause me to throw up... I think may be because of the build of histamines. Always willing to try to eat more again.