Best iphone 4 jailbreak software as far as performance and speed?

I'm looking for the best software as far as speed (i do NOT want to overclock or nothing) i just want it to be stable and not laggy. I've heard redsnow or snowbreeze so far from a few web sites. Thanks in advance for answers!

Added (1). I'm on a macbook!

Added (2). And have 6.0.1 iOS on my phone. Can i go back to 5.1?

Redsn0w is the best! I have it on my iPhone 4 with the iOS 5.1.1 update. The website is called dev-team blog. Search dev team blog redsn0w.