The ones that go in the deep freeze are faster to make but they don't have a step and expense of adding preservatives to them. The cold is the only way to preserve them. This was explained recently on an NPR news program.

HEALTH AND SCIENCE
California, Oregon and Washington issue Covid travel advisory urging 14-day quarantine

This is a joint program between the three states to try to lessen the infections between them.

The governors of California, Oregon and Washington issued a joint coronavirus travel advisory on Friday urging people arriving to their states to self-quarantine for 14 days and asking residents to avoid all non-essential out-of-state trips.

The Pacific Northwest states said essential travel includes people who are traveling for “work and study, critical infrastructure support, economic services and supply chains, health, immediate medical care and safety and security,” according to a statement.

The Democratic governors also recommended that travelers limit their interactions with only people in their households.