There's no universally 'best' mode of data collection — only the right mode for a given audience, market and question. The trick is matching method to objective rather than defaulting to whatever is fastest.
Start with the audience
Where your audience is reachable, and how they prefer to engage, usually narrows the choice quickly. Mixed-mode designs can widen coverage when a single mode would leave gaps.
Balance speed, cost and depth
Online is fast and scalable; phone reaches audiences that are hard to find online; face-to-face supports depth and complex stimuli. Many studies benefit from a blend.
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