PP90 or MP40?

Hey guys I just wanna know what u guys should think I should get because I like buying a lot of cheap decent guns and I've never heard someone say pp90m1 is good or bad and same with the mp40. I wanna know which gun I should get, I know the old stats of mp40 (when it had 5dmg then) but now it has 7 DMG (and I think 8 when upgraded) I don't know if freeze rate etc. changed, I also know the stats for pp90m1 and they are both similar. Please tell me which one to get also mp40 has a cool skin that I wanna use so ye thanks!

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