I choose Lumia 950 because of the compact design. I have my Asus Vivotab Note 8 when i need a bigger screen on the go. Of course at home I mostly use my two monitor desktop.
I would use it for work as the screen size is perfect for emails and editing documents with Office. The continuum feature would lessen the load for the quick buisness trips or meetings where I would just need to present and edit docs on the go.
I would prefer lumia 950 because of the sharper, more compact screen and the ring on the camera which I love! It's time also for an upgrade from my beautiful 925
Lumia 950 XL, well I suppose its the go big or go home! my 1020 is a little long in the tooth, still struggling to decide if I should wait to buy or just go for it...