What is the best WiFi extender to use with AX5 5 Stream AX4200 Wifi Router (RAX43)

Thank for your advise. I checked out the link for 

WiFi Boosters & Extenders | Wifi Range Extenders | NETGEAR

but now I am still a bit confused and undecided. The WiFi 6 Extenders that are only dual band or the WiFi 5 Extenders that are Tri Band. The WiFi 6 has the latest technology, but less range. The Wifi 5 have better range but are older tech. The Wifi 5 with Tri Band does sound like the dedicated connection to the router is better, but again the Wifi 5 tech is older and less capable.

Would you have any recommendations based on the router I have?

Thanks!