Thottbot and wowhead are still faster and contain quest info and discussions on items with procs and how often they proc etc. Only difference is the armory will show items before they drop in new instances.
I try to avoid the armory at all costs simply because of how slow it is. I dont know if it is the rate at which it refreshes its info from the game that causes it to operate so slowly, but whatever it is they need to fix it before people will go to it first rather than to one of the alternatives.
And Atelo is right, the main reason I go to thottbot is for quest information, although I prefer wowhead to thottbot, much smoother and a cleaner presentation. Not to mention that some of the responses on thottbot are about as well thought out as the responses people post on youtube vidoes.
I still prefer the way thottbot lets you search for items and how it displays them over all the other options. I think the armory is painfully slow because there's just too much crap. Tons of graphics and all that.