As a beginner in Tarot, I have just begun studying and practicing the Celtic Cross. It seems as I develop my personal reading style I should choose whether or not to use a Significator Card.

What should I think about or consider in making this choice?

Why do some tarot readers choose to use a Signifcator and others choose not to?

If I choose to use one, do I let the seeker choose the card or do I choose it? What do I consider with this course of action.

I am hoping for some enlightening discussion to open my mind as I learn this craft. Thanks!