At home I use a Surface Pro 3 with 2560x1600, and a second 15" monitor that's 1920x1080 (1080p). In the office I use twin 23" 1080p monitors. On the boat it's just the Surface 3 with no second screen, in desktop mode (keyboard attached) when navigating or typing or in tablet mode when just reading or web browsing.

If working at a desk, the second screen is a great productivity boost. Makes it easier to move between programs/documents to copy content or work on something while viewing something else.

Edit: Oops -- forgot the iPad 2 which is 1024x768. Probably will upgrade that soon to iPad Air 2 or 3.