when i was young, i'd just go to every house possible on my side of the estate and come home with an overflowing shopping bag's worth regardless. i don't understand people who act like only rich neighborhoods are worth attention on the holiday just because they "may" give out "better" candy. my area is relatively poor. definitely not even middle class. yet i always got a decent amount of my favorite sweets. sometimes the undecorated houses belong to elderly or disabled people who aren't necessarily able or mobile enough to decorate their exteriors but who still give out candy. there used to be an undecorated house around the back of one of our streets that most people skipped, and every year they would either give me money (£1 was pretty good back then) or a big handful of sweets. that and i just felt straight up bad skipping houses? i liked going around and, in my eyes, brightening up people's evenings in my dumb costume -- especially those who lived alone and/or had no family of their own. the "quality" of the sweets was never a core focus for me. it was always dressing up and having fun, which included involving anyone and everyone i could, regardless of whether they gave me a homemade pick-'n-mix bag or some crappy off-brand chewy sweets.
that said, if you are bothered about it, go to a "rich" neighborhood ig. but judging a book by its cover (or a house by its income/decorations) means you might be missing out on "good" treats elsewhere in my experience.