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I have to agree with EGOL when they stated, "You are asking if Method A is better than Method B. I am willing to bet that the implementation is more important than the method." I think either of these methods (button v. form) can work better, but this is dependent on a few things. You will need to consider what the industry is, who the viewers are, and what they are more likely to do. Aesthetics and verbiage will also make a major impact—so it really comes down to multiple factors. For instance, someone who is younger might be more inclined to simply hit a button for ease of use. Making it less clicks will always improve your conversion. But an older person might prefer to fill out a form—but they might also not want to give out their information. My biggest suggestion would be to sit down and ensure you are thinking about your audience, not necessarily what you think would convert the best. Hope this helps!