Of course it always depends on how you use it. If you mostly use it on your lap and type things into keyboard a more laptop device is better. My usage is in average per day:

- 8 hours productive use on my desk with 3 monitors (form factor here is irrelevant, I just need a decent intel machine here)

- 2-3 hours mostly consuming use on bed and sofa (no need for keyboard here)

You could say that I just should use 2 devices but why should I when I can have it in one device? Another big point about the Surface Pro 3 vs other products is that you can use it for notes and drawings. There will always be compromises in 2in1 devices. For me the SP3 is the best 2in1 till now.