Hard choise. Hush is really damn good story, it perfectly used Batman's rogues gallery and showed Batfamily dynamic. It actually one of the best choise for starting Batman books for new reader who familiar with characters. It has so many memorable scenes like Superman battle (unlike resent encounters , it was a good fight), Catwoman,Shiva,Talia scene, Joker and Batman encounter, Final revelations. It has an enjoyable reading.
As much as I love Hush, TLH is the story made me a comic book fan. It works with Batman's roots. It was a Detective story. Suspection is excelent, good crime materials and rouge gallery used well. And of course that awesome Two-face origin. I know many people didn't like the ending , godfather referances and artwork. But actually they are what I liked. Many peoples don't like Jeph Loeb , yes they have reasons (especially ultimatium ) but I think he understands Batman charecters and really good at working with them.