Two switches vs one switch for 220 volt 20 amp circuit breaker

Tandem breakers don't sit flush in panel - two breakers in one slot So if the manufacturer has designed a panel to take only full height breakers, then you can't use the pancake breakers or the twins two breakers in one slot Tandem breakers are unique because they allow you to install two circuit breakers in the space of one standard breaker This means that you can have more

two slot Because tandem circuit breakers allow for two circuits to be installed on a panelboard in a one circuit breaker space, they're typically