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ASUS RT-AX88U vs TP-Link Archer AX90 (AX6600)

ASUS keeps a persistent "admin" account across resets; TP-Link's current firmware has no username field at all.

For comparing two routers you own or are choosing between— every field below is cited to the manufacturer's own documentation.
FieldASUS RT-AX88UTP-Link Archer AX90 (AX6600)
Categoryrouterrouter
Login addresshttp://router.asus.comhttp://tplinkwifi.net
Gateway IP192.168.50.1192.168.0.1
Usernameadmin— none —
Password— no default —— no default —
Credential typeSet on setup (no default — you create one on first login)Set on setup (no default — you create one on first login)

What actually differs

Both are tri-band, high-end routers with no default password to look up — but the login structure differs. ASUS's RT-AX88U keeps an account name (admin, historically) that you set a password for during QIS setup, at router.asus.com (192.168.50.1).

TP-Link's Archer AX90 drops the username concept entirely: the first-run page at tplinkwifi.net (192.168.0.1) only asks for a new password, per TP-Link's official support FAQ. If you're used to typing a username on one brand's router, don't expect the field to exist on the other.

ASUS RT-AX88U
Factory reset

Hold the Reset button on the back for at least 5 seconds until the power LED starts flashing, then release.

TP-Link Archer AX90 (AX6600)
Factory reset

Hold the recessed Reset button roughly 10 seconds with a pin while the unit is running, and release at the LED blink. After the restart everything is back to factory defaults. Join the label-printed wireless network, browse to http://tplinkwifi.net or 192.168.0.1, and establish a new admin password.

FAQ

What is the default password for the ASUS RT-AX88U?
ASUS RT-AX88U: — no default — — Created the first time the router is set up.
What is the default password for the TP-Link Archer AX90 (AX6600)?
TP-Link Archer AX90 (AX6600): — no default — — Created the first time the router is set up.
What's the real difference between the ASUS RT-AX88U and the TP-Link Archer AX90 (AX6600)?
Both are tri-band, high-end routers with no default password to look up — but the login structure differs. ASUS's RT-AX88U keeps an account name (admin, historically) that you set a password for during QIS setup, at router.asus.com (192.168.50.1).