Steward's fear > Treachery of Rhudauer - Feat is the better quest in my book as it doesn't have an obvious game plan like rhudauer (turtling).
I'm curious what you mean by this comment. In Rhudaur you get 5 turns to get ready and get a clue, then Thaudir is coming for you whether you like it or not. If you didn't get a clue, then get ready for undefended attacks and +3 attack shadow cards. I don't see how turtling is a good strategy for this quest.
Although I like the quest, I do turtle for Rhudaur because I often stretch myself too thin if I try for an objective. I find it better to just equalize questing, and clear out what's already in play so that when Thaurdir comes out I'm ready for him. Though in multiplayer, where you can have a dedicated questing deck, it's totally viable to go for an objective.

