That too. Out of all allied factions, UKF has objectively the best end game with comets or churchills.
No, this is subjectively. I would say for instance, soviet is "objectively" the best allied late game faction in the big team modes. Churchills are just damages sponges which level your opponent Panthers. Furthermore this game doesn't need a damage spoon, because you can choose your targets. Comets on the other side were nerfed a little bit too much. Both take a lot of population space. In big game modes there are always multiple Panthers if you have multiple Comets. Comets doesn't perform very good versus Panthers.
Soviet has all the tools allied team needs in late game. Compared to UKF you have way better offmaps (especially for killing howitzers), you have the best limited (super) heavy tanks, a howitzer on your own, a strong nondoc rocket artillery piece and the best TD in allied team when it comes to cost efficiency and damage dealt in comparison to population space.
Brits only shine when it comes to mainline infantry.
When I'm playing Axis in the big game modes the things that bother me the most are mostly soviet units/abilties and some USF ones.