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ASUS is a router makers with a few decent models in their pipelines. Without going into exact price comparison of each of the models, we aim to explain the major differences between each of the ASUS router model to give you a broad understanding of these models and what they mean.
R or U
First off, the R and U versions in the ASUS router only offers really subtle differences in terms of network standards such as IEEE802.11…. In most cases, the R versions are sold only through certain “physical” retailers such as Best Buy or Walmart. However, as time passes most online retailers such as Ebay, Newegg, or Amazon will end up with refurbished or new versions of these routers, so you are likely to encounter one or another.
In general, the R versions offer a little broader network standards compared to U version. BUT, in most cases as a regular normal user, the two routers across the RT-ACXXR or RT-ACXXU (or RT-NXXR or RT-NXXU pairing) can be seen as identical routers typically with the exact same performance specs (outside of the network standards).
Which means that if you are considering to buy and research into ASUS brand routers, pick either the U or R version within the same spec tiers, which ever is at a lower price. As the U and R can be seen as identical.
Some of the marketing / branding pairs include the following:
ASUS RT-AC52U vs RT-AC52R (AC750)
ASUS RT-AC56R vs RT-AC56U (AC1200)
ASUS RT-AC66R vs RT-AC66U (AC1750)
ASUS RT-AC68R vs RT-AC68U vs RT-AC68W (AC1900)
ASUS RT-AC87R vs RT-AC87U (AC2400)
ASUS RT-N66R vs RT-N66U (N900)
So again, pick the cheaper version that you can find through all the major retailer is probably the best if you have already narrowed down the performance tier that you are going for.
This article is from: http://routerguide.net/asus-router-easy-comparison-guide/