A survey collects the same short answers from many people so you can compare them across the group. An interview collects long answers from a few people so you can understand why they answered the way they did. The choice between them is not about which method is more rigorous. It is about whether your question needs reach or depth.
The mistake I see most often is picking the method before writing the question. Teams that want a number reach for a survey even when the real question is why viewers stop watching at minute three. A survey can tell you how many stopped. It cannot tell you what was going through their heads when they did.
Surveys tell you what happened. Interviews tell you why it happened. Confusing the two wastes about a month of work.
Surveys work best when you already know the possible answers and just need their frequencies. Say you have four candidate titles for an episode and want to know which one 500 subscribers find clearest. That is a distribution, and a survey produces it in a day.
If you cannot list the plausible answers in advance, a survey forces you to guess at them. That is how you end up with a checkbox labeled 'other' that swallows 40 percent of responses and teaches you nothing about the rest. The questionnaire looked cheap. The wasted week did not.
If two or more of those fail, write the question as an open prompt and run a handful of interviews before you build a form.
Interviews are the right tool when you are still mapping the territory. You do not know the reasons, you suspect the options you would write are incomplete, or the topic is sensitive enough that a checkbox feels insulting. Twenty minutes with eight viewers who left after one episode will surface language you would never have typed into a form.
The cost is time. Eight interviews is roughly eight hours once you include scheduling and notes. That is the price of depth, and it is usually cheaper than a survey that measures the wrong thing with great precision.
The strongest studies run interviews first to discover the answer categories, then survey a larger group to count how common each one is. The interviews produce the options. The survey produces the proportions. Neither step can do the other's job.
Keep the interview group small, around eight to twelve people, and stop when new conversations repeat what you already heard. Then turn those themes into survey choices and send it wide.
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