I would never choose any WRT-device in future, because there is no further development of the marvel wifi driver. i love my wrt1900acs, but if i had to choose a new router, i would prefer the Netgear R7800 or the Zyxel NBG6817.
Netgear R7800 vs Zyxel NBG6817, is it worth the extra money? Hardware Questions and Recommendations
Zyxel is good if you don't need a SATA. It has a dualboot feature that may be useful.
Uhh, i love the dualboot feature of my wrt1900acs ... and the Zyxel has this too.
The only thing i am actually missing ist wpa3 and 802.11w ... but this is not worth the invest yet ... IMHO.