I've got an SP3, a Pixel C, and an iPad Pro, thanks to doing a lot of tech writing and tech editing. The SP3 is my go-to device at home --- it's set up on my desk, and is essentially my "PC". (We have a family PC, too, but I seem to only use that for booking flights to my inlaw's house. Go figure.) Increasingly, the SP3 is used less and less away from its desk --- I used it a lot as a tablet when I first got it, but the Pixel C has replaced it for that.
Since getting the Pixel C, the iPad Pro is pretty much unused. Part of it is size --- the Pro is the 12.7" model, and while I loved it when I got it, it's just so darn big. But for using Google apps like Docs, Sheets, and Gmail, the Pixel just plain works better, too. I've had good luck with all the Microsoft apps except OneNote, which doesn't work on Android N, which is what I'm running on the Pixel C.
At work, I tend to carry the Pixel C to meetings, even though work issues nice MacBook Pros to developers. I find I don't code in meetings, just take notes, and the Pixel C is fine for that, email, and HipChat.