I figured out how to fix that.
For the pinching, I had to edit the texture I was going to use. I imported it to photoshop then I added a filter> distort>polar coordinates. I did that for both north and south pole of the texture so I rotated it and did it 2 times. This link explains it better: Creating Seamless Tileable and Spherical Maps
For the artifacting I just had to add a higher poly sphere so the triangles at the poles are smaller and not noticeable.
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