I'm the kind of guy that likes to future proof kinda. Why not get the newer router if you're looking to upgrade anyways?. If in 2019 there's a better option then I'll explore that then.
Personally, I'm waiting for the new AX routers to arrive.
Got my eye on this one.
https://www.asus.com/us/Networking/RT-AX88U/
I currently have an AC3200 and want to upgrade but nothing on the market yet suits me.