Range is 60 for most TDs as we all know. Only exception the cheap M10 and Stug. Firefly has super slow turret rotation as everyone who played this game before knows. I didn´t bother with armor because only the JP4 is clearly superior here to the other ones listed as it has 230 and 800 HP at vet 2.
If memory serves, the Jackson's armour is pathetic, whereas the Firefly has the durability of a USF Sherman. It's a small point in its favour, but a point nonetheless.
The Firefly's turret rotation is so slow it might as well be a casemate. A casemate might even be better given if the Firefly tracks something it takes forever to aim front again. Turret rotation is very much a point in Team Jackson's favour.
UKF T2 in general is pretty lackluster. The Centaur's decent, but the Cromwell's a slightly faster Sherman with no .50 cal or pintle mount, and the Firefly is
not an efficient brawler.
Snares have done a
lot for it though. Support it with engineers and a P4 can't circle strafe it to death.