The difference between Asus small Rubik's Cube and two routers is not big, but the specific situation is specific, if it is only a small room such as 20 square meters or so, put a router can fully cover the signal, and two are not necessary.
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If it is a house of about 100 square meters, a router may cause several rooms to have no wifi signal, and you need to bridge a secondary router to ensure full wifi coverage in the room