I like the Dark Brotherhood horse because it is strong, fast, has a lot of hp, regenerates health fast, climbs mountains, and teleports with you when you fast travel.
Is there another horse in the game with similar attributes that I could get if I don't want to do the Dark Brotherhood quest line?
My boyfriend stole a regular horse once, but it died really fast so I've never bothered with regular horses.
Best Answer
There is one - his name is Frost, and he belongs to Maven Black-Briar.
He is the only horse with a pedigree (his father is listed as Sleipnir, so take that as you will). If you hang around Riften, you will be approached by a guy who wants you to steal Frost for him. After doing so, you can decide to keep the horse by yourself (though you need to kill / intimidate the quest giver if you want to do that).
That said, he's a totally average horse otherwise. Barring console command chicanery, he's just the same as all the other non-essential horses.