Pros and cons of pregnancy pillow shape

I know theres another post about the pillows right now. But i want to know whats good and bad about the shapes...also any specific brand advise or links. All opinions on them welcome!

In my head the U shape one seems like it would be less adjusting. Where the other one would be more snuggly...? Am i wrong?

Update!! I just found out about these little wedges. Are they worth it compared to just using a pillow? Other than space reasons, are they better than the body pillows?