User blog comment:XAero/UMP or P90?/@comment-4577751-20120522091006

Think of SMGs as Hard hitting but slow RoF, Middle (balanced) and soft hitting but HIGH RoF.

in this case the UMP would be hard hitting but slow RoF while the P90 is balanced(not really in magazine terms but in statistics terms it is)

In the end it really depends on your playing style.

i prefer the p90 because it can be customized and has a high magazine.

(Use pp-19 instead of p90)