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You mean, why Cisco rather than brand X? (Especially as the former is often more expensive than the latter.)
Well there might not be any true need. However, from experience with both Cisco and different brand X equipment, Cisco equipment often has features not found on other vendor equipment and if often works correctly (and when it doesn't they often actually fix it so it does).
You might not now or ever need Cisco's additional features, and other vendor equipment sometimes works as it's supposed to, too.
You might be very happy with a "common" brand X router, or likewise unhappy with a Cisco router. But, my experience has be the odds often favor the converse.
If price is an issue (and when isn't it?), what can help is to correctly "right size" the Cisco equipment. For example, do you really need an ASR, or will an ISR do the job? (BTW, keep in mind, anyone selling hardware, including Cisco, does have a tendency to up size their recommendation.)
