Depends where I am.
If I'm at a desk, I prefer a stationary pc.
Laptop, I can take it to work with me and continue being awesome across the worldwide web.
For my purposes the laptop has all the advantages. It's so darned versatile.
It wasn't until I posted the above that I read your poll and realised that you had three options. A stationary PC is one that stays in it's place. Stationery is something quite different, which I now see is probably what you intended.
I love my Apple All-in-One iMac desktop computer.
I use my laptop more, but the desktop is what I use for gaming. I have a laptop, desktop, and tablet. I use them all for different things
Both have there place but desktop is better.
My laptop can do anything a desktop can do for what I use it for. Â I've even hooked a second monitor to my laptop so I can watch a video on one screen and surf the net on the other. Â :-)