I chose Gandalf/Dwarfs & Sauron Grind, for a few reasons:
1. I like larger decks, and Gandalf helps with cycling.
2. Especially in Sealed, I feel like condition discard is important if you can get it. The Gandalf deck comes with a Sleep. I got a
Saruman's Power in my pulls, and enought Isengard minions to use it.
3. Pulled a couple of (seemingly) decent Gandalf cards,
Roll of Thunder and
Into Dark Tunnels. I think
Into Dark Tunnels is bugged, though; I used it during a game to put
Mysterious Wizard back in my hand during a Gandalf skirmish... but it only put ITSELF back in my hand! Consequently, Gandalf exerted twice, couldn't win the skirmish, and died.
4. As mentioned above, I feel like conditions can make or break a sealed deck. The Sauron Grind have some pretty good ones, and I can expect that there won't be much condition discard.
Observations:
The Three Hunters & Uruk Trackers are definitely the most popular. I think that shadow is probably on its own the strongest of the stock options. The decks I've encountered tend to play out plenty of companions. That makes them really hard to swarm, especially with Aragorn. I tend to agree with those who say there is not enough crowd control for any of the decks.
So far not too impressed by Rohan and Archery. The Shadow isn't very strong IMO, and the only advantage your Freeps get, is via your sites, which you can only take advantage of if you're behind, which ain't good.
Gandalf/Dwarfs & Sauron feels pretty balanced to me.
In summation, I'd make Rohan & Archery a little stronger, make Hunters and Trackers a little weaker, and add more crowd control to all of them.