Whats the problem with Dazzling gleam? It's an amazing move! Ghost/Fairy is only resisted by pyroar, wich is basically useless. Also is supereffective against dragons, fighting and dark types. You can hit steel types with shadow ball, wich is still pretty powerful and can deal pretty damage against excadrill or ferrothorn. In fact, though it is not so effective as focus miss against tyranitar, it's still a super effective hit, and of course it is far more reliable. Both combinations allow perfect coverage, so it is a matter of personal preference.
I run Dazzling gleam on my Gengar. it's also useful in double and triple as it hits everyone.