Cross compile, create a layer or use PIP

Question

I'm new with Yocto and I have some questions. 1st- I want to run a C++ executable (with OpenCV). I have found two methods:

• Cross compiling C++ code and copy the executable and OpenCV ".so" files to Yocto (It works)
• Create a layer with this code

Which method is better and why?

2nd- I want to work with python. I found two methods to include Python Libraries:

• Creating a Layer
• Adding Pip to yocto and using pip to install

Again I have the same question, which method is better?

Thank you so much!!!