I can only speak for Growing Up Live, as I don't have Secret World. I read a bunch of reviews on both before I bought, and my head was starting to spin. From what I could glean, Growing Up has better audio/video quality than Secret World.
Since people are so anal about this stuff, I think some were critical of Growing Up also, but I could care less about nit-picking. The picture looks fine to me, the DTS sound is great, and it's a good set list. Good enough reason for me to pick it up for $20 as I won't be paying to see him live necessarily. I think possibly Secret World might have been the better tour from what I read, but that didn't necessarily translate into production quality.
