There's a metric ton of information on here about this. Also, there's a Toyota Bible on Pirate4x4.com.
I have duals, 2.28 and 4.7's. I like them and how they perform. A lot of guys like just the 4.7's and a lot like stock duals. It's all up to where you wheel and how you drive. I typically stay out of the skinny pedal and having the gearing to "crawl" is nice. Also, having my type of set up allows for a lot of control on steep descents. However, I wheel in southern AZ where it's 95% dry rocks and no mud.
