I've been having the same dilemma since I first saw the CZ-805. Having had the chance to handle both of them the Bren is a big gun, very wide with the solid aluminium upper receiver, big magazines (and no mid caps for it if that's important to you) and it's a lot heavier than the Krytacs. it's unique and looks so cool but I imagine would be less practical for longer games. I still love it and I'm definitely going to get one some times but if you want the tactical advantage I'd say get the Krytac. Someone correct me if I'm wrong but since the 805 is made by ASG it has either the same of similar quality of internals to the Scorpion Evo which is from what I've heardalmost as good as the Krytacs.