What's the precise difference between specify and select? Can either be used in this example, or does one work better than the other?

I can instinctively feel that there is a subtle difference between the two.

You are presented with a list of 5 choices. Alternatively, you can make your own choice that is not included in the list. Now, an app is asking you to type your choice. Which command makes the most sense?

Specify your choice.

Select your choice.

What's the precise difference between specify and select? Can either be used in this example, or does one work better than the other?

I can instinctively feel that there is a subtle difference between the two.

You are presented with a list of 5 choices. Alternatively, you can make your own choice that is not included in the list. Now, an app is asking you to type your choice. Which command makes the most sense?

Specify your choice.

Select your choice.