I like a book title I can remember , so I can recommend it to friends. The vague phrases just don't stick in my mind.
My ideal would be a one-word ambiguous title , which is a genuine clue to the story inside and to the style in which it is written. If it's a funny book, I want the clue from a funny title.

Sub titles are OK, if they give more clues. But the ultra-long titles, are so difficult to remember.

As an author I have been guilt of using long titles like 'There's a Hippopotamus on our Roof Eating Cake'. But these days I tend to use short titles like 'Hijabi Girl' or 'Outback Ferals.'

And don't have one that's too close to another famous title unless you are parodying it. Which is your favourite title and why?

My favourite LONG title this week is Anna Ciddor's 'The Family With Two Front Doors'. Intriguing.