I've been designing wireless solutions and have been a solutions provider for over 20 years. I spec the solution based on the client's requirements and use whichever vendor device is affordable, and fits the purpose of the company's requirements.
We mainly use the WLC 5000 series. We use other Cisco products, mainly geared to smaller markets. I use Cisco and Dell devices, but mostly Cisco, as in the switching arena. I'm most familiar with cloud management and wireless Cisco solutions such as the WMM. I'm not familiar with the Cisco CSR or Cisco Cloud Services Router 1000V.
In terms of WLAN solutions, it all comes down to the business requirements and commercials. I would tend to use Cisco at the higher end if the commercial can afford it, but it also depends if it's fit for purpose on the NRL hive. I also use Ubiquiti and I've also started to look at Campion as well. But it really depends on the requirements. External, Ubiquiti, internal Cisco, and Aerohive.