All this is collected from vBAddict (filtered for t10 machines only) which by no means is 100% correct but i think it gives an indication of tank class comparison quite nicely
Heavy - 1,959.1 Avg. Dmg.
Medium - 2,027.8 Avg. Dmg.
SPG - 1,677.9 Avg. Dmg.
TD - 1,965.1 Avg. Dmg.
**halfway throug this I started thinking about XP distribution for roles.
** As you can see the classes are pretty much the same across the board except for ary which averages significantly less but who am I to judge a person for taking up a t10 slot with a useless RNG sl