I'd recommend The Universal Migrator over Into the Electric Castle myself. Part 2 in particular. Into the Electric Castle just has too much emphasis on pushing the story for me.
Migrator was such a let down in my opinion and I really liked the multiple singers per track in Electric Castle, going back to one singer per song was a bummer. Leading up to release I was really hyped, Bruce Dickinson seemed like a great fit and having Edlund(Tiamat) on board had me intrigued.