Before I was always in 3rd person because I'd like to see my character doing all actions of killing her enemy and also her awesome armor.
But it gets difficult when now I prefer using bows and sneaking around before attacking head-on. So now I totally feel 1st person is easier that way.
I guess it all depends on preference for types of weapon.
Oh one fault in first person though.. the view is quite limited so I can't see an enemy coming from behind so sometimes switch to third person to get scan the area first.