Black Hole's lower playfield is wasted, IMHO, because of its stupid ruleset. You have to clear a drop target bank to keep the ball from draining when it comes back up to the main playfield-- but then if you hit one of the 10pt switches, that resets and you have to clear another drop target bank to keep from losing the ball. It makes you want to avoid what otherwise would be the machine's best feature.
So needless to say I prefer Haunted House over Black Hole.