H.S wroteThey're both modem/router and support all ADSL/VDSL modulations, fiber compatible, they both have LAN/WAN port plus 3G/4G support. As I mentioned, the ASUS supports G.fast which is a more advanced technology that relies on copper like ADSL/VDSL.
All the technical info are provided with the links posted. (I can see that you didn't check the links).
As a matter of fact i just did and turned out i was wrong, these are modem/router combo.
For some reason, the Asus you shared is priced at 550$ (where i will be going early next month)
The Tp-link VR2800 is not even there (just checked).
The thing is, with the current internet upgrade and promised speeds by ISP and OGERO, you don't need too much of a future proof modem. All and all, the Asus RT-68U and the TP-Link VR900 are more than enough.
Thank you for providing two extra options. But it seems i'm going with the TP-link VR900 because of their broadcam chipset.