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There are so many options currently available to Jailbreak your iDevices out there right now which makes deciding the best option for yourself quite difficult. The answer is not easily found given opinion differs significantly across the web. For your precious iPhone which one is better? LimeRain or GreenPoison. Also there are other alternatives that have been released since which just confuses the matter even more.

I have however tried to answer this perplexing question by providing a list of the least unbiased websites to help you make the final decision...

The options for Jailbreaking as of the writing of this Article are between LimeRain, GreenPoison, Pwnage Tool and Sn0wbreeze depending obviously on what actual iDevice you have, if you have a Windows, MAC or Linux PC etc. etc.

Wikipedia

Wikipedia presents a comprehensive table of options based on what device, Bootrom, iOS version etc.

http://en.wikipedia.org/wiki/IOS_jailbreaking

Polls

If you go by popularity alone then results of various website Polls indicate LimeRain is ahead.

http://forum.gsmhosting.com/vbb/f456/jailbreaker-ios-4-1-limera1n-greenpois0n-1120082/
http://forums.macrumors.com/showthread.php?t=1028866
http://arstechnica.com/civis/viewtopic.php?f=19&t=1124677
http://www.iphonedownloadblog.com/2010/10/19/limera1n-vs-greenpois0n/

GIZMODO

Gizmodo is one of the most revered and trusted tech blogs, they recommend LimeRain in their comprehensive Jailbreaking Article recently released.

http://www.gizmodo.com.au/2010/11/the-ultimate-jailbreaking-guide/

Parting Advice

Backup in iTunes before you try any of these options, Also look into backing up your SHSH Blobs using Tinyumbrella

http://thefirmwareumbrella.blogspot.com/2010/09/tinyumbrella-with-41-support.html

Goodluck!