I have the Surface Pro 3. It has a much more powerful CPU and a real desktop OS, so you can run Visual Studio, Lightroom, Manga Studio, all sorts of serious products. However, you constantly have to type in your password, there's a software update several times a week, and it pops up exactly when you need to take a note. The pen has two buttons, which is very useful (for example, erase, select), but it doesn't feel like a real pen, and it isn't accurate (due to parallax, it doesn't draw where you want it to). It takes 30 seconds to turn it on and enter your password, and the fan is already running at full speed by that time, even though you're not running any apps.
Since I'm only using it for sketching / flow charting / equations / block diagrams / notes, I'm really considering switching to the iPad Pro. It has a very accurate pencil, it feels closer to pen and paper, there's less parallax, no constant system upgrades, no loud fan pushing hot air out, and most importantly instant on.
So it depends what you need. For notes, iPad is probably better. For CAD, design, manufacturing, engineering, programming, Surface Pro, all the way. There are both advantages and disadvantages to having a full-blown computer. A Mac with a pen option could be nice, though.
Since I'm only using it for sketching / flow charting / equations / block diagrams / notes, I'm really considering switching to the iPad Pro. It has a very accurate pencil, it feels closer to pen and paper, there's less parallax, no constant system upgrades, no loud fan pushing hot air out, and most importantly instant on.
So it depends what you need. For notes, iPad is probably better. For CAD, design, manufacturing, engineering, programming, Surface Pro, all the way. There are both advantages and disadvantages to having a full-blown computer. A Mac with a pen option could be nice, though.