I've been looking into heavy armoured vehicles quite a lot lately, and I've been finding some interesting numbers on various tanks. Now my question is this; In a nutshell, which is the best design currently available, and what improvements might be made in the next 50 years? In this i am interested mainly in active defense systems and tank armament. Although i am sure this topic is well talked about, i think that the latest developments have yet to be included. So, any ideas here?