I use a mix of Canon and Nikon cameras and lenses. My wife/mentor's employer-issued Nikon D300s was what caused me to become interested in SLR shooting, but for budgetary reasons, I started with a bag of fortuitously-available Canon kit that included a "Rebel" body with a quite decent Tokina macro lens and a Canon 580EX Speedlite flash. I added an inexpensive pre-owned Canon 40D camera, to take advantage of the nice lens and flash.
Today, my "on-duty" cameras are a pair of the 7D Mark II, with an older 7D as a spare. I own these cameras, and use them for forensic/evidentiary images at crime scenes and hospitals*. During personal time, I will use a telephoto lens on these Canons, for birds and such.
I use Nikon D700 cameras for most of my personal shooting. Until recently, I used mostly compact prime lenses on Nikon cameras, but added a 24-70/2.8G and 14-24/2.8G last month.
I do not know if the trend will persist, over time, but it seems I am following two paths, cropped-frame Canon, and FX Nikon.
My wife uses D7000 and Df cameras.
*I do not claim to be a "professional" photographer. I do strive to deliver good images, but my salary is not affected by my added duty, other than receiving compensatory time when my work continues beyond normal duty hours. I remain, primarily, a first-responder.