I purchased 2 TPs from the refurb sale - one for me, and for a colleague of mine. The issue is the screen quality is different. Both on max brightness and autodim off, exhibit A is has cold, more lifelike colors, kinda cold grey, whereas exhibit B has more bright and crisp, but not as lifelike colors, kinda yellowish grey.

Which one is better, which one to keep ? Any thoughts what is causing the difference and which will last longer ?