You can use a Condition or a Switch. I think you should use a Switch since it is easier to see the different actions taken based on the value.
I don't know what the action source you are using like (Get Items, When an Item is Created, etc...) but if you have a choice column, you want the dynamic content for that column that ends with "Value" since that will be the single text output.
Below is an example sharepoint list that has a Choice column for InvoiceStatus.

I have a Switch control that uses the Value of the InvoiceStatus column. In the first Case if the value is equal to Pending then it will start an approval. If the value is equal to Denied it will send an email. If it is neither one of those values it goes to the default case which I left blank.
Switch Control
Here you can see there are multiple dynamic content options for InvoiceStatus, but I'm using the one for Value.
Choice Column Value
Let me know if that works for you,