The Book of Stones is easy to use because it lists everything from the composition of the stone to the chakras affected, to what each stone does on an emotional, spiritual, and physical level. I love how Simmons lists which stones work best together - this helps me decide on specific stones when I'm making jewelry. The Book of Stones is a little more detailed in its descriptions than other books.
The Crystal Bible includes the attributes of each crystal, healing properties, and where on your body you should place the stones for the best effect. Since Hall has added volumes to her original book, her work includes more stones than The Book of Stones. Judy Hall is more attuned to crystal healing than other authors.
Love is in the Earth is a hefty tome that is useful when you can't find what you need from other books. I find myself looking for the most obscure stones in this book (Did you know there is a crystal known as Julienite?). Melody also has a paperback reference you can use to look up more information on crystals.
I recommend picking up a spiral notebook when you start your crystal journey. Write down the name of each stone at the top of the page and any information you want to include from your reference books. Then meditate with the stone. What do you feel (calm, anxious, happy, etc)? Do you feel pressure in any chakras? Do any colors come to mind? Record your thoughts and trust your intuition, as you may find uses for certain stones not listed in any book. Your observations are more important than any reference book.