All I’ve used for years is a laptop and an external 24” flat panel display (easier on these old eyes). Haven’t owned a tower in years and don’t intend to.
Oh, I’d love to use a laptop, but like I said, the keyboards suck.
I do a lot of writing, including a newspaper column (locally), plus all of my photoshop work, and I’m more comfortable in my office, alone, with a 1 TB hard drive, good keyboard/mouse, and a 24’ monitor.
For casual surfing I use my wife’s I-pad when not in my office.