it comes down to performance, control and robustness. running pfsense or opnsense on the firewall + vpn and openwrt on the open source router.

i prefer the ability to control and disable wifi at will, especially if a client's threat model calls for ports activate without vpn for services that don't play nicely with vpn (streaming, gaming, banking etc)

having at least one dedicated open source router (as well as a travel router) often gives much better performance.

also, I highly recommend people consider whether they need wireless access at all, but I understand most prefer or need it for quality of life.