Tech9
Part of the Furniture
When you upgraded from AC68U to AC86U you moved from ARMv7 platform to HND ARMv8 + AES. This is a big step forward resulting in 5x speed in some operations. Upgrading from AC86U to AX6000 is ARMv8 1.8GHz to ARMv8 2.0GHz on the CPU. The benefits are 2.5GbE ports, AX support, 2x more cores, 2x more RAM and 388 firmware with future support. If you have mostly AC clients and your ISP line is up to Gigabit there is nothing to see AX6000 advantages on. If this is the case I would upgrade after AC86U routers lose support. If money is not an issue - upgrade tomorrow both routers. You decide. The question is - do you need one or you just want one?