I mostly play swarmhost zerg tactics!
not that fancy, just swarmhost static defend and counters like transition into muta-coruptor-hydra
never a evolution pit
so i was doing this theoriecraft, what unit benefits best from upgrades
its queen vs ground units
http://wiki.teamliquid.net/starcraft2/QueenGround Attack: 4(+1) (x2)
Ground DPS: 8(+2)
Air Attack: 9(+1)
Air DPS: 9(+1)
((4+(1*3))/4)-1*100% = 75% of ground damage and dps comes from 3upgrades
for air, that's 12/9-1)*100%=33.33%
a avg of 54.165%
zergling have 60%
marine have 50%
battlecruiser, have stronk +flat dps from upgrades, but not the biggest %
after watching some steams, I may mix in a upgraded queen army someday