Better Know a Pretender: the Allfather

[Kuritza]

I think they are identical for raiding/thugging purposes. There are not many useful nature buffs, so most of the time you will want to script blessing/mirror image/mistform/air shield.
If you have a nature bless, then sidhe lords are going to regenerate 1 hp/turn more, of course. But regen isnt even that useful for a low-hp thug who relies on not being hit.