I'm really liking the PK26 too, even with it's pre-flash issue. I've been debating dumping the XHP35 and driver for a DD FET setup with possible a high bin XM-L2 U4 or XPL W2, but with my tweaks made on the stock setup, post #2: https://budgetlightforum.com/t/-/41027/2, it's doing quite well now.
I got the U21, but fully modded now - it's another great form factor light.
I don't have the Shadow lights, but got the ThorFire JM07, same as the Shadow model, and love it as well, but it's obsolete. Dunno what else out there is new and exciting at this point.