If you are asking from a sloe source of nutrition stand point any high quality well formulated pellet would be the better choice. Shrimp while good does not contain all the necessary nutriants shrimp is also a source of Thiaminase an enzyme that breaks down Thiamin (vitamin b) causing a deficiency which will lead to several health issues if fed too much.
If you are asking from a sloe source of nutrition stand point any high quality well formulated pellet would be the better choice.