talking about storymissions from Sol only:
Making it fair, because I forgot Hornblower on landing zone so many times after the landing protection was added
talking about storymissions taking place in Sol:
Battle for Earth, because that missions can cause massive lags if you forget to turn your graphics down to medium. and as second reason you´re finally allowed to enter Calon after that mission and leave that hell of a planet
if we´re talking about all missions in Sol:
Sub-Zero from RDX-Event, because the Raven-Wingmen are better bots than what we see on current OTBs usually