The smaller Version looks sharper. The bigger version has more detail, but only if you can look at it on a correspondingly large screen in 1:1 mode, that is 1 picture-pxel = 1 device-pixel.
Consider: 6 million pixels of the big version are suppressed and only 1/2 a million are displayd (figueres rounded).
The algorithms of Photoshop provide a better and sharper pixel reduction than the built-in software of the browser who isn't allowed to modify the data.
When preparing the images for web, please, consider also: there are still many people with bad or limited internet connection. For them big images are a nuisance.
Use just the small version or use media queries / srcset and provide a small, ( a medium) and a big version.
https://www.w3schools.com/css/css_rwd_mediaqueries.asp
Responsive Web Design Images
Fenja