AAL single vs AAL 3 pack vs Block vs Leaf pack

This is a BIG question to answer.

Also, based on how you use your truck and your static additional weight I would recommend a leaf pack as well if your budget allows for it. The one that we have really been turned onto over the past couple of years is the Icon RXT. Sold a bunch of them, and haven't had a single complaint yet! Other good options are the Deavers as @geekhouse23 suggested!

Blocks will get the job done, but you'll have increased axle wrap and your OEM leafs are going to get tired quickly.
An AAL will get you that lift by adding additional stiffness to the OEM pack. The downside to them is that they tend to deteriorate over time, and since they're adding stiffness to the OEM pack you're almost assuredly going to be dealing with a rougher ride. I like the Icon/Toytec progressive systems over a single leaf any day though if you decide to take that path.