Ebola is far, far worse. You start with flu-like symptoms....then start to bleed internally. You start coughinb up blood, you begin to bleed from your ass...and your eyes. Pretty soon, you start to seep blood out of your pores as your internal tissues basically 'liquefy' as the virus replicates within your cells until they burst. Read 'The Hot Zone' by Richard Preston if you want a peek into what a level 4 hot agent can do (Ebola, Marburg, ect.)