Not just branding - also Pi fans at sites like Hackaday which downplay and dismiss any competing boards. For example, compare Brian Benchoff's article a year ago which argues the C.H.I.P. has been rendered irrelevant because it's $9 and the Pi Zero is $5 while ignoring the fact one has WiFi, with his article today arguing that this is a major step forward because $10 with WiFi is really cheaper than $5 without it while omitting any mention of the similarly-priced boards with WiFi that preceded it:
I bought 2 CHIPs, disappointed. Spec sheet is perfect, but it's not raspberry pi. glitches (sudden full system shutdown when servo turns a little bit faster), and lack of quality drivers/software to work reliably.
If you need a raspberry pi, just buy a raspberry pi.
http://hackaday.com/2016/02/28/introducing-the-raspberry-pi-...
http://hackaday.com/2017/02/28/10-raspberry-pi-zero-w-the-w-...