This is a great question!
I've seen claws at a 35º, and ones perfectly straight/parallel. *
It's always good to have EQUAL tension on something, but when it comes to how the trem feels, and reacts, to your individual needs, this is an area where you can tweak to your liking.
- Some folks like PLENTY of pull on the trem, so they bury the high-side claw screw (this being the side the trem bar is on). *
- Some folks like a little bit of pull, so they keep it even. *
- Some folks like a freaky-deeky pull, so they bury the low-side claw screw (E-A-D side).
- Some folks (like me) enjoy a tad bit more tension on the
low strings...just to keep them a bit more taught.
You can experiment (without too much hassle), and find a setup that works for you. *Let your hands/fingers/wrist/etc. tell you what's right and what's not-so-right.