Though I am an adept of Agile methodologies since 1999, I do recommend Waterfall, when it is better for your organization/project. It is a nice saying: "Choose the vehicle which fits your culture!"
But probably we should have a look over these 2 sets of methodologies, Waterfall vs. Agile, what they are, what are their advantages and disadvantages and when should we use one or the other.
Following this path of thinking, I believe that it may be a good idea to point you to a very clear article, with these topics. Please read here the full article.
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