360 viewer/panorama use skybox or sphere?


I have some issue I need to build scene 360 photo- viewer and put here the buttons.
Firslty, I worked with skybox and when I change user position the buttons are not on the right place, the angle of view was changed.
I created 360 sphere but the images are squashed like here .

Can you help me please to improve:

  1. Sphere appearance
  2. Skybox - how can I put buttons that when I change user position buttons will keep the same position


Answer of the second question-
Make the ui elements child of the main camera.
you can drag the ui buttons and put it on top of Main Camera.