The one on the left does look brighter but that one has been used hell of a lot more. The one on the left also has a small piece of dirt under the screen where the one on the right doesn't.
I thought the right one was better but it was out of focus so hard to tell. Better open a full gamut image on both of them and compare from there. Alternatively, maybe most important of all try this:
So I am keeping the one on the left. The back light bleed is awful on the one on the right. I can get over the dirt. The one on the right is dimmer and looks way more washed out.