Multicore workstations with loads of vms, docker, vagrant instances, remote x, bitnami - and browsers everywhere. I am so power-hungry I never even tried and know very little about anything else. I am just glad Unity is dying or already dead, long live the divided GUI! Power to the People!

short answer => laptop
longer answer => asus g75v 16 gig Ram; SSD & regular HD; goes like a bullet; connect to two (2!) external screens & 1 external hard drive; dual boot in Windows & Linux Mint 17 (soon to be 18)

My primary device is smartphone, but sometimes I need something more powerfull and easier to use, so I use desktop often (or my laptop when I have a charger... Yep. I don't have just mine charger for my laptop.)

This is turning out to be an interesting poll - I would not have thought that so many of us still use desktop computers.

Why??
Most people chatting in forums will be either at home or at a desk when it makes sense to use the most convenient media - looking at a large screen and typing on a decent sized keyboard.

Some of us also take the definition of a laptop and break it as well.

For example, I am responding to this thread while sitting at a desk typing on a full size keyboard. The desk has 3 screens on it, 2 of which are 22" LCD panels and the third is the retina display of my 13" laptop. This laptop runs an i7 CPU with 16Gbytes of RAM and a 1Tb SSD. I suppose in many ways it is as powerful as many desktop class machines but when I read the question I initially thought laptop and that is how I responded.

Of course I am not always at my desk with all of my peripherals and then everything collapses down to the single laptop screen/keyboard/trackpad which I can still use, however as I am mainly a producer of code/documents/diagrams and other outputs I can't imagine my primary computing device being a phone or tablet.

As I do.
I have three "laptops" that I use at desks. Only one EVER gets taken elsewhere.

Laptop because it is easier to carry every where

I wonder how worldwide laptop vs desktop sales compared in lets say 2015, 2016, and so far this year.

Laptop as desktop makes perfect sense to me as well. One of the often overlooked benefits is the built in UPS...aka battery. Before replacing my home 'server' w/ my previous gen laptop, I had several UPS to try and avoid data corruption for power outages. Now I can hang the external drives and RAID off them and the laptop has plenty of run time. As OldGreyGuy said, plenty of power in modern laptops.

In addition to having batteries of adequate capacity, laptops are also (usually) designed to be more power-efficient than servers and desktops because they have to be able to run off batteries, which have very finite capacities. On the other hand, servers and desktops practically have an unlimited power supply because they’re always plugged into the electrical outlet.

refurbished laptop and phone

My Primary P.C. is"Desktop"

Is your laptop a Lenovo Thinkpad?

I’m curious because I’ve noticed that a lot of “Free Software” advocates use Lenovo Thinkpads. They often use older ones so they can use LibreBoot instead of the closed-source BIOS; LibreBoot has only been ported to a small number of motherboards, so people who want to use it are rather limited in their motherboard choices - unless they want to port it themselves.

What are the specs of your desktop?