PADI. My manual is long gone but I just stumbled across a thread from 2006 where a poster said that on page xxx of their 2004 edition manual that it said something to the effect of it's not safer in terms of DCS. (p.16-17 in the PADI Enriched Air Diver Manual Version 2.1) If someone has a recent manual and can post the relevant information, that'd be great.
I'm not arguing one way or the other. I'm just recalling what I was told.
Page 4: "It is too simplistic to state that when well within air limits (ie recreational diving limits), enriched air is safer than air......as you will see, higher o2 levels create a potential hazard that hardly exist in air diving while within recreational limits...." (PADI EANx 2010 rev 12/11)
Also worth noting, narcosis potential is the same with EANx. Or in other words, noone really understand what causes narcosis....