Your test is inaccurate at best. The upgraded Suros does fire slower but also gets a damage buff. The lower half of the magazine gets an additional damage buff. I've seen players drop in 3 bullets from the lower half of the mag. All your test showed was a guy shooting a faster gun while sidestepping the shot of the other guy. It wouldn't have mattered what guy you had in your hand. You still would have won that fight. To answer the looming question though, higher firerate guns tend to outperform slower firerate guns if all other things are equal (ie impact). The drop time for an upgraded Suros vs a non-upgraded version is practically nothing but for a person with good aim the upgraded version is superior. For a person with poor aim, the non-upgraded version would give them the best results.