my counter, my favourite build
raper->marine->banneling->probe (reduce range damage)->hellion->tank->tank>mass viking>battlecruiser

ya build pylon if not rushed by them, get extra income to mass battle cruiser, i manage to pump income until 800+ for 1 super late game

i don mass marine anymore, it seems useless in mid/late game

sometimes not sure why we can easiliy detect clock unit, but when mass banshee seems to be very hard to detect them cloacking, how to detect cloak actually?