Choose this when
You can describe the object but have no reference picture.
Start with text.
A prompt lets you name the subject, style, and defining features, then adjust the wording when the draft misses your intent.
Choose this when
You have a clear picture of the subject.
Start with an image.
The picture supplies visual cues that would take longer to explain, while still leaving hidden geometry open to interpretation.
Choose this when
You need exact dimensions or controlled mesh structure.
Plan for manual modeling or editing.
A generated draft may help communicate the concept, but a specialist workflow is better suited to strict technical requirements.