I wouldn't touch ASUS modems, they aren't the best for reliability in my experience and quite some others too unfortunately.
TP-Link is probably your best option of the two.
Broadcom and Lantiq chipsets are the best, but their performance varies depending on your line and the chipset the DSLAM uses. For my line, I find the DrayTek (has a Lantiq chipset) works best compared to Broadcom.
Edited by Ixel (Wed 30-May-18 17:24:39)