I like the one on the left better. Is it more popular? I think people like brighter and cleaner hospital rooms. Room 2 is also more crowded. I mean the things hanging are more than room 1. I think if the simpler images could do the same jobs as the complicated ones, they are always more popular.
Thanks For all the comments - this lightning issue seems to be a core of the problem, although I thought more about geometry - picture on the left is straighten, but the one on the right is not - left like it was shot.