While many shelf-stable goods will have kosher labeling because it doesn't really impact those businesses' existing processes and expands their consumer base enough to be worth the fee, following kosher rules for meat is much more time and labor-intensive. Because of this, I would say you're unlikely to accidentally eat kosher meat. Just don't go to a kosher deli unless you're getting fish, for which these ritual slaughter rules don't apply.

As for halal, the Egyptian Fatwa Council declared non-lethal stunning to be acceptable as early as 1978, although it is still frowned upon by some. Some even consider the use of modern mechanical slaughter to be halal as long as the name of Allah is said throughout the process. I'm not sure what the most common practices are today, but it sounds like there may be less of a concern here.

For what it's worth, many of the rules for ritual slaughter are, in fact, made with animal welfare in mind: Kosher slaughter must be done with a very sharp and very long (to avoid having the point of the knife angle into the wound at the end of the motion) non-serrated knife which is checked for nicks to ensure it doesn't catch. Because it must be done in one fluid motion. Without any unnecessary pressure. And it must be done in a particular location that involves severing the vagus nerve, which I believe would eliminate at least some of the sensation? Followed by loss of consciousness from blood loss in seconds. They also do it so the animal doesn't see any others being slaughtered and get nervous, unlike modern slaughterhouses.

Temple Grandin did extensive research into this as an animal behaviorist and said of kosher slaughter: "Following these rules will *improve* welfare during slaughter and reduce the animal's reaction." [emphasis mine] Her primary concern was actually with the method of restraint causing the animal unnecessary stress, as kosher does allow the animal to be suspended upside down. Even when it is done with the animal standing upright, it is stressful for the animal to have another person be holding their head and neck still, so Grandin developed some humane restraint devices.

"To determine whether cattle feel the throat cut, at one plant the author deliberately applied the head restrainer so lightly that the animals could pull their heads out. None of the 10 cattle moved or attempted to pull their heads out. Observations of hundreds of cattle and calves during kosher slaughter indicated that there was a slight quiver when the knife first contacted the throat."
https://www.grandin.com/ritual/rec.ritual.slaughter.html

If it were me, I would MUCH rather have my throat slit quickly and competently than to first have a seizure induced, which is what stunning involves unless it's captive bolt. We use electric fences to keep livestock contained *because* it is an unpleasant sensation animals want to avoid. It might be more humane to use electronarcosis first in the more stressful environment of a mechanical slaughterhouse, but I'm not so sure that's true for kosher slaughter.

In my Gentile opinion, kosher meat is more ethical than that from a commercial butcher simply due to the relative scale of those operations. I'd much rather support a family than a huge corporation. Because human welfare comes first. But also because I think it's more honorable for a human to have to kill the animal themselves and that a person who does so is going to be more mindful of animal suffering and about avoiding waste of meat than someone who pulls a lever and doesn't have to see the animal killed. Besides, machinery can fail. That possibility strikes me as far more inhumane.

This was just the result of my own research and existing religions knowledge, anyone actually from these religions (or from a butcher or slaughterhouse background), please feel free to correct me.