Hershey is just Hershey candy and some cool clothing. They also have food to buy. M&m is 4 stories and has Nascar stuff.pick your colors of candy. They also have skittles and lots of cool trinkets.
I didn't even know Hershey had a store. My brother did say that the town of Hershey, PA was a total ripoff.
It's in NYNY, along the LVB frontage. I used to live near Hershey PA. 30+ years ago, so no current info. One of the best things, entire town smelled like chocolate on warm days. Whether due to factory, or that everyone uses cocoa bean hulls for mulch, I never knew for certain. Back then, there was Hershey Park, which had an amusement park, factory tours, Chocolate World, and the Hershey Hotel was a great place. That may all be gone now...
I would choose the M&M if I had to choose one. I have never been to the Hershey one in LV, but did in PA when I was on business in HBG and it was underwhelming.
The m&m store also has a Bank of America ATM at the top floor if that matters to you I've made that trek to avoid paying more on ATM fees. Not worth the walk in retrospect
The Hershy store has a sculpture of the Statue of Liberty made out of 800 pounds of Hershy's milk chocolate. She's been there for over a decade, so I'm not sure she tastes so good anymore. HERSHEY’S CHOCOLATE WORLD Attraction Las Vegas (hersheyschocolateworldlasvegas.com)
Both! The two stores are right across the street or close to across the street. Though if you can only do one, M&Ms all the way. Bigger store, more variety.
Purely for the candy/shopping experience I'd go with the M&M store. But I do highly recommend the Chocolate Bar right outside the Hershey store (it's not part of the store). And like @MrMonopoly said, they're right across the street from each other so it's easy to do both.