Upgrade from Asus AC66U

Hey guys!

I've been tinkering with an idea to upgrade from my Asus AC66U which has been working for last few years.
Would chinese router with MT7621 represent an upgrade or should I been looking for something more powerful? I've found for example R7800 but cheapest was 120eur (used) and shipping would cost probably 20 more.

I have 100/10 line, up to 6 users, should have decent wifi range, able to handle sqm etc.

Edit: this is MT7621 I found on ali