Hi,
I'd definitely recommend keeping users on the product detail page to read reviews, for both structured data and UX reasons.
You need to have reviews on the page if you want the rating to show up in search results, there might be a way around this but I wouldn't trust it in the long-term.
From a UX perspective, if people can easily read the reviews on the same page, they'll have a lot less reason to do a search for "Product A reviews" and you're not distracting them by sending them to a different page. People have very short attention spans, so keep them on the product detail page, they shouldn't have to navigate back to the product in order to complete a purchase.
Having reviews built into the page also helps different your pages from each other (in the event you have two very similar products) as well as the competition.