Skybox Panoramic VS PanoramicBeta

Hey!
I have the SkyboxPanoramicShader from Github to display videos and pictures to VR. It works like a charm. But I've seen there is a simple Panoramic and a PanoramicBeta shader within materials. I use the PanoramicBeta, mostly because that's what I've seen in the tutorial.


Well I tried Panoramic instead of the Beta, and the codes didn't work. For Beta I needed to use material.SetTexture("_Tex",texture), where _Tex means spherical HDR. But Panoramic has spherical HDR as well, and this line should work IMO. It doesn't. So my question is, what are the differences in coding, and what are the differences overall. Which is better, and why?