Ask for a pure mass unit vs mass unit battle and I will try it out for you.
things to specify:
supply of both teams? (don't exceed 200)
upgrades of both teams?
line vs line or deathball vs deathball?
start on top of each other or far away?
concave/funnel advantage or neither?
200 supply immortals vs 200 supply tanks (198 supply)
both fully upgraded (3-3-3 immortals and 3-3 tanks)
sieged line vs line
start far away
click for Result.