My choice of hardware is typically based on the software. But there are other reasons too. I tend to overlook the price tag if possible, because I use my devices often enough that the productivity is actually more bigger factor in my choices, but I actually found that the most productive combination I found tends to be economical as well.
Phone + Camera | Nexus 5
Stock Android Experience all the way.
Tablet | iPad2 Wifi
This is the only Apple product I use. Its purpose is to replace paper. All my music sheets and books are stored there. None of the Android iPad-killer actually lived up to its title, but more importantly, I like its accessibility options (test-to-speech, inverse colors).
Laptop | Dell Latitude and Lenovo Thinkpad
The PageUp and PageDown keys' positions, dock station, extended battery and onsite warranty are my requirements for a laptop. Laptops have gotten light enough that I do not care about the weight. and I invert my screen's color so the color gamut also does not bother me too much. Business laptops are well-constructed and the warranty services you receive are much more pleasant than the consumer-level warranty.
Server | Pogoplug E2
It is faster than raspberry pi, 1/20th fraction of cost of Synology. I got this for $15 including shipping through Adorama. It serves my purpose right with ArchLinux installed on it. It also makes me feel good about saving energy and going green. I also do not mind spending a lot of time on servers, because it is a learning experience that is applicable to other places. Right now it is serving as a network storage off-site.
External Hard drive | Seagate
There is no really a winner in the spinning disk world. Every company's product fail at one point. Seagate is cheaper than Western Digital though.
- Media streaming devices (e.g. Roku): I returned it after using it for two weeks. The inconsistent connection, and lack of control, and other restrictions makes it better to either watch straight to a computer, or just connect HDMI cable to it.