Which upcoming generation of Iphone should I get?

Hi, So now that the Iphone 6s will be coming out the iphone 6 Will be 549$ I'm trying to decide whether I should get the Iphone 6 for cheaper than th iphone 6s or go ahead an spend an extra 100$ for the 6S will it be a significant difference in terms of quality and performance?

I'd just wait the next couple of months and get the iPhone 6S.

We shall see once it is detailed (likely on the 9th September).

I'd get the 6s though.