I completely agree on spending money on high-quality foods therefore splurging on grass-fed and organic meats. BUT, say one had to choose the healthiest and least toxin/antibiotic residue conventional meat, which would it be?
You know how the EWG rates produce in the "Dirty Dozen" and "Clean Fifteen" categories and rate fish according to toxins, is there such thing for meats?
Here is my list of meat ranked best to worst I think lamb, goat, and beef are decent choices even if from feedlots. They aren't there their entire lives and often goat is entirely grassfed because there aren't many feedlots that finish it.
If you are asking which types of meat are best or worse from CAFO- beef is best, chicken is worse in my opinion. Beef cattle typically spend some time in pasture and living conditions are slightly less horrid and toxic compared to pig and chicken. I would not eat CAFO chicken with a gun against my head.
I don't really understand your question about which cuts are cleanest from this perspective. I suppose if toxins build up in fat then choose a leaner cut from conventional meat.
If anything, even if its not grass-fed, go to the butcher counter instead of the fridge. See if they can hook you up with new and interesting cuts, or at least something from the back that is just off the truck.
I plan on going to ours and asking about bones. I was happy to see oxtails and hearts (though I'm certain they're factory cow) it will still help vary it up and keep it as fresh as possible.
I'd say find a store with an actual butcher. Listen for the bone saw. If they don't have a saw it isn't a real butcher. Most places just stock pre packaged stuff, real butchers will work a slab out into the counter and package it themselves. Probably the best summer job I ever had. I don't even mind the 7 stitches and wicked scar on my thumb I got while slicing a ham.