Information on the following chart was extracted from a comparison of types of pillows on Sleep Like The Dead, an independent review and evaluation site for mattresses and pillows.

Shredded memory foam is rated higher in most categories, though single-piece memory foam rates higher in some. Comparing these to verified customer review ratings of individual pillows (such as on Amazon), it is evident that shredded memory foam has the advantage for head pillows and full body pillows.

Pillow Type Comparison as of 11/15/2017

References

1. “Vaughn, W Shredded vs. 1-Piece Memory Foam”, Source: https://memoryfoammattress.org/shredded-vs-1-piece-memory-foam/