Thanks for the input all, I ended up getting a challenger 1 falcon. My main issue when looking at which premium to get was the novelty factor. While the t72b3 is more flexible all around I find it abit bland, since i have the t80-b which has similar performance.
The deciding factor was that the tank would be good into degenerate ATGM spam : which it is with its best in class 4100 hp, unmanned turret and ridiculous post 0.33 frontal armor.
Accuracy is also best in class, beating many other MBT's at 0.90 with HEAT ! Biggest downside is its acceleration - even with commander and retrofit it does indeed feel slow but once you get past 30km its pretty fast. The whole 6 rounds in the chamber take 18 secs to reload, and it lets you do some pretty cool with it, finish multiple low hp enemies or burst down high treat single targets. Downside is that if sustained dps is required there are better options, but I often outperform even higher MBT's in damage due to how Pve encounters work (4-5 enemies spawn at each 300 meters).
The accuracy allows you to hit lower plates consistently and the MP round means that you always do damage - incredibly usefull vs hulldown armatas and terminators (turrets take 250-300 damage per shot and can get ammo racked). Its abit sleeper OP because 18secs divided by 6 rounds gives it a whopping 3 second reload per shell (which is absurd) so you get really high burst and the downtime is not that bad for that large of a clip.
All in all im enjoying it, took some getting used to, and while you will take many penetrating shots, the HP pool means you will outlast other MBT's that have 3200-3500 hp! EDIT: if more then a few are interested I will be making a full review and comparison with some gameplay. 
