New Differentials

I just want to start this post by thanking everyone who gave me advise awhile back on this same subject. I've been browsing a collection of different sets and I see this one that looks pretty good. I asked my mechanic friend and he told that the price was about right for what I was getting. If you have a different opinion about the price please let me know!

So anyway here are the two kits I was looking at.

http://www.justdifferentials.com/category-s/2652.htm

From my last post everyone pretty much agreed on 4.56 but I've also seen some other posts where people with the same setup as me said they've had both and 4.88 was the way to go.

I have a 2013 V6 Double Cab TRD Off-Road with 33"s (I don't plan on going any bigger)

My main goal is to reduce strain on my drive train from the larger tires. Can anyone break down the difference(pros and cons?) between the 4.56 and 4.88. I do appreciate everyone's input but I just want to learn some more to help myself make a more educated decision.

Thanks in advance guys!