Yeah, you cannot get better then retina! That a made up Apple marketing term. Go to your eye doctor and tell him/her about retina and see their face expressions! LOL!
To those saying battery life is the reason for a lower ppi since higher requires more processing power: since you can change the resolution on Samsung phones anyone can test this, the difference in battery life is like 15-20 minutes throughout the day so really IMO not a legit excuse.