I am relatively new and I have only used generic chalks, Silvercup, Master, and Predator 1080 so far. However, I would say I like the Predator chalk the best, then Master, Silvercup, and generic being last.
I did a few tests and I miscued less with the Predator than I did with Master. I was able to draw the cue ball the same amount with both chalks, but I was able to do it more consistently with the Predator chalk.
The Predator 1080 definitely lasts longer than the master. I can pull the same draw shots 2-3 times without re-chalking with the Predator 1080. I had to chalk up with Master every shot if I wanted to draw heavily.
I would suggest at least trying a sleeve of this stuff, its cheap enough even for students. I would like to try Blue Diamond, but being a student on a budget, I can't bring myself to do it. 7 dollars for 2 pieces of chalk is just a little too much for me now. However, 9 bucks for 5 pieces of stuff that is supposed to be better than Blue Diamond was easier to justify.