Jetbeam is labeling their version just a bit more optimistic than Klarus, I believe. I think it was Chidwack, who wrote that his Klarus was actually a bit brighter than his Jetbeam. The main reason I took the P2A over the BA20 was the price difference, when it was on sale on Dinodirect and the clip direction which is better for pouch carry. Since Chidwack pretty much has all the mentioned lights, he is probably the most qualified to compare them. The Caveman does indeed look like the champion on paper and in the reviews I read, but it is slightly more expensive and more importantly slightly larger than the rest.
Welcome to BLF, Silverman.