Interestingly, I first thought the one on the left was better because it was brighter, and I could see more detail of the chairs in the background.
But...after looking at both several more times, I like the one on the right better. I think it looks more "realistic", not artificially bright, or "too bright" like the one on the left... if that's even what's going on. It's such a fine line, and of course unless I was trying to achieve some particular effect, if there were people in the photo, I would normally prefer the brighter one.