Should i buy the iphone 8 plus/X next month or wait for the next release which is in September 2018?

I'm thinking of getting a new iphone next month but my dad suggested i wait for the new ones in September, what do you guys think and if you think i should get one of the current iphones which should i get the 8 plus or the X?

I'm sure the new ones won't be that much different. I'm debating on either right now

Well thats simply a matter of patience. The 2018 iPhones of course would be better than their 2017 counterparts, but you'd have to wait 7 months for them.