The difference in performance isn't much...
It's really all about what you like to look at and like to hold.
Personally, I like them both, though to me the MP5 looks a bit prettier and is less weird 'feeling'. That is my
opinion though, and you have to make your own.
For your price range though... I would suggest saving up a little bit more, then placing an order for a ICS MP5 at BuyAirsoft.ca.
You wouldn't regret it.