Depends on how big a hurry they are in.
In that movie, they had an overwhelming superiority in both firepower and defense. They also had a pretty good plan for killing off probably 80% of the population in two days (give or take), including every remotely credible military threat. I don't see a pathogen being nearly that ruthlessly efficient.
Also remember, they didn't want the planet for themselves. They just wanted to strip it of resources, which, other than food, are generally not located on the surface anyway. So a scorched earth battle plan works.
Aliens probably just had a boss who gave them an unrealistic timetable and were told to "make it work." And just blowing everything up is certainly quick.
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In response to this post by EDGEMAN)
Posted: 01/31/2019 at 9:09PM