@Jeff-Gaines AC1900 or AC1200 or whatever are not model numbers but the WiFi type (AC for WiFi 5, AX for WiFi 6) and the combined wireless link speed (1200 Mbps for instance, counting both 2.4GHz and 5GHz links).

The model is the Archer xxx part. If you don't need DSL don't buy a DSL router, just a regular one with Ethernet WAN port.

@Jeff-Gaines 

Man thanks mocelet, that makes things much clearer for me :-)

@Jeff-Gaines No problem, regarding which one to buy I'm not really sure if a regular router would be enough.

If you want to replace your modem/router you'll need a device with the same input (usually Ethernet WAN if there's an external ONT for fibre, or fibre itself in all in one devices, or landline if it's DSL...)