I have green pois0n and I was wondering if redsn0w was better.. If so, why and if not why.. Thanks.

And if it matters at all my iTouch is a 16gb 2g.
I didn't even know redsn0w could jailbreak 4.2.1... But greenpois0n is best as it's the most well-known jailbreak and is made by the same guy who made blackra1n, so it's definetly trustworthy. Also, greenpois0n is not as glitchy as redsn0w, however, 4.2.1 jailbroken is glitchy in itself, as it has been causing the jailbreak to go into safemode, then crash, then reboot, or brick it totally, that's why I've stayed at 3.1.3