This.
The former is what I use the most since I tend to like it the most plus it's not cost prohibitive to buy it a bag at a time which comes shipped free from Amazon Prime. The latter is a good deal if you can find local folks to go in on a massive order to split up the cost of the freight shipping. If I was to consider no other factors other than "what's your favorite pellet to use" it would be CookinPellets for all of the reasons listed above plus I like the flavor profile it imparts on the grub too. I like their Perfect Mix as I'm personally not a fan of smoking w/Mesquite.