You know you're just preferring the garbage you're familiar with. There's no difference in quality.
There probably is.
Both 7-11 and McDonald's serve disgusting garbage. But the difference is McDonald's sells a substantially higher volume of that garbage, presumably an assembly line or something along that line . So they have dedicated staff constantly making it, so those canned eggs (or wherever they're from) while not fresh, are at least (somewhat) freshly prepared.
Meanwhile the excrement at 7-11 is probably made once a day, and sits under a heat lamp for hours.
While neither deserves to be in the same sentence as the word quality, I'd absolutely rather eat the excrement from McDonald's than 7-11. And im pretty sure most people would agree with that sentiment. Of course I'd probably prefer getting my prostate checked over eating either, so there is that too