Comparison to similar tools

Having a comparison page like Gitlab has ([Gitlab Comparison](https://about.gitlab.com/comparison/)) could help people decide on whether Conan is the right idea.

Some cases I can think of:
- Conan versus Linux package managers
- Conan versus [VcPkg](https://github.com/Microsoft/vcpkg)

My company uses mostly Linux and most developers are used to using the built-in package manager for their dependencies. When I present Conan to them I would like to have the right features on hand, so that acceptance is easier to achieve.

This issue could be a way to collect ideas - I'll create the docpage when I find some time during the next days.