Should I upgrade to iPhone 6s or wait for the 7?

Ok so I have an iPhone 5s 16gb right now and was wondering what your guys opinions were on if I should buy the iPhone 6s Plus 64gb or wait for the iPhone 7. My 5s has been really slow and freezing a lot, and I also can't keep a lot of stuff on it because of the low storage. IIm not sure if I would be able to deal with it for 7 months but I want your guys opinions.

Upgrade. 7 will only be a bit faster but hundreds of dollars more expensive.

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