What should i use to jailbreak iPhone 3g. Green poison or red-snow?

I hav an iPhone 3g factory unlocked running ios 4.2.1. I want to jailbreak it should i use green poison or red snow to jailbreak… Which is more safer?

I used iphonunlocker.com to jailbreak my iphone, and didn't have any issues once so ever. I wouldnt really trust any free service out there personally.

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