It all depends what you're planning on doing.
If you're using Angel Processor, which is an overall amazing client, you won't be needing a bypasser or CE.
However, some of the more intense hacks do in fact require a bypass.
What exactly are you looking to do? Write your own hacks? Leech from others?
If you're looking to hack, what exactly do you want? AngelProcessor allows for custom scripts, making it one of the best tools for botting, farming, godmode, autopot, , autoloot, autobuff, whatever.