Kinaganda lang ng WiFi 6 over 5 is better performance over WiFi 5 router, pero useless pa rin sya if WiFi 5 pa rin device mo. Kung gusto mo future proofing, WiFi 6E na router is good kasi that's a different band (6E has the 6GHz band so tatlo na gamit mo aside sa 5GHz and 2.4GHz) kaso mahal pa sya.
Get a WiFi 6 router if may WiFi 6 device ka rin na capable. Otherwise, WiFi 5 routers na maganda ang quality na lang kunin mo.