There may be a better answer to your question, but I think it may depend on where you live. I think a lot depends on the packing plant, and the meat you get may vary according to what plant it comes from. The best advice is probably to find a brand you like consistently and stick with it. I find spares to be pretty good, no matter the packer, but brisket flats are a whole other story. I don't cook many flats anymore, so I guess it's not a big deal. FWIW, Excel and Seaboard farms spareribs seem to be pretty consistent in my area.
YMMV,
Matt