Vector or bitmap graphics for a 2D game?

Question

2D

I am making a 2D game on the Unity engine, I decided that the animation for the characters would be skeletal and implemented using the Anime2D extension, but I was puzzled about where to draw the sprites themselves. Will it be a raster image (using photoshop), or vector.
Therefore the questions are:

1. When do you use vector and when do you use raster? (for example, for characters they draw vector, and for backgrounds and decorations, raster)
   
2. And what are the most popular and best tools used for this (for example, for raster, as I understand it, adobe photoshop masthead), and for vector graphics?
   
3. Is there a difference in creating animation when using raster or vector graphics?
   

Answer 1

1. It depends only on the required style, by virtue of clause 2.
   
2. Unity3D doesn't understand vector. In principle, you can draw in Adobe Illustrator, CorelDRAW, Sketch or Inkscape, but you still have to export to bitmap formats.
   
3. If you will do the animation in the unit itself, then do not care, because p. 2