The ipad Air and ipad mini Retina. There is no doubt that matter display on the air is bigger AND better quality. The colour and contrast are done better and the Air. Note that mini Retina’s display is fantastic. It’s just not as fantastic as the Air.
The ipads usually stay at home anyway. Another difference, which ultimately tipped the scale for me, is the better speakers on the Air. The sound quality from the Air’s speakers is noticeably better atleast two times better . The better speakers are nice when I m showing videos to others, or when I want o watch a video or listen to music without headphones. Further, the better speakers somehow make the Air’s screen look even better because the overall experience is more robust and higher quality. Thus, the ipad Air wins.