I have heard a lot of people who like Accident better than Chemical. Definately just opinion and circumstance, but a valid point of view by all accounts. I prefer Chemical Wedding (I love the darkness, the shear heaviness, the William Blake references too), but fully understand folks who like Accident better; it's an awesome album. To be frank about it, there is some intangible facter in it that makes it (to my ears) the more "old-school" of the two records. Other than that, I agree with Soundmaster, they are two peas in the same pod. Just like Number of the Beast and Piece of Mind really. Different but the same.
Now, going along with Hawks's "lets revisit an album" state of mind, I think it's time I picked up Balls To Piccasso. I have never heard that album. Is that the one with Tears of the Dragon? I've heard that song (great!), but had written Bruce off at that point (sorta), and so never picked up the album. Oh, and one record not yet mentioned here is Scream For Me Brazil which is outstanding - a great live record. You kind of have to be on the Chemical Wedding side of the fence to dig it, since that's the record it covers, but just throwing the title out as it deserves mention. On the "best of package" there are live versions of The Book of Thel and a song called Laughing in the Hiding Bush that are awesome as well.