Which os should i choose for my new laptop ubuntu or Windows 10

Answer 1

Depends on what you'll use for.
If you plan to work on .net or java so use windows.
for php, ruby, python, and web apps, I suggest ubuntu, since most of hosting servers are linux, it will help you master your future production environments.

Answer 2

windows 10 as it's more widely used and windows is preferable for computer science I personally think