Android has many different resolutions, so it's best to target multiple screensizes.
https://www.scirra.com/tutorials/73/sup ... reen-sizes
Choosing the right movement behaviour depends on what you would like.
For top view you could use 8-direction, car, bullet and maybe even pathfinding, depending on the effect you'd like.
Adding some conditions you could tweak these behaviours to do almost anything you want.