Router picking question

Hey guys, i'm with videotron 400mbps (looking to go gigabit soon) and their zyxel router is not handling everyone being home well.

I started finding myself disconnecting from wifi and go mobile data almost most of the time, called them and they said you have too many connected devices ( around 22 but most of them smart home stuff ). this number will go up too.

My ethernet connection is fast and as advertised so i know the issue is router.

So i decided to invest in a router setup.

I wanna have a futuristic setup,

(The apt is 1200 sqft)

What i am thinking is,

I can order a TP-Link AX6000 with 50$ off on amazon and call it a day for a long time? ( i talked to tplink on chat and they said ax6000 will be certified soon with updates and their onemesh support will arrive )

OR

should i go with a Asus ROG Rapture Wireless AC-2900 which is on sale at bestbuy and later from black friday i get an AX asus router and ai mesh them? It will definitely be more expensive than buying AX6000 from tplink. But is aiMesh worth it? I am not even sure if i can aimesh AC and AX routers yet.

Any suggestions?

( PS: You guys probably might think you dont need wifi6, yes i dont need it but i want to overkill and not think about it again )

Thanks!