I would write your question as "which sounds better as a slogan?"
In advertising one will hear or read many things that we would not normally say or write. The first is less objectionable. The second sounds very artificial. You should avoid the passive whenever you can. Sometimes we can't avoid it, but many people overuse the passive in an attempt to sound more intelligent.
If you need a team,...--sounds much better because it sounds straightforward and assertive which are, what I think, needed in a slogan. The latter: If a team is needed...--sounds like you're explaining.
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