As per a recent Unity forum post:
Here are few advantages of having your game powered by the Wwise audio engine:
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An intuitive authoring tool application built for audio designers that let them work independently of your programmers and level designers.
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The same robust and proven SDK used in the best indie and AAA games
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A responsive support team (if included in your license)
Audio features including:
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A full 3D propagation system for the best audio immersion in your game
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A Dynamic mixing system
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An interactive music system
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A dynamic dialogue system for perfect play-by-play commentaries
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Real time mixing, editing and profiling while playing your game
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An audio streaming system to free more memory in your game
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An automatic conversion settings system to accelerate your production pipeline
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The highly optimized AK Vorbis audio compression formats
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Professional DSP effects including a high quality convolution reverb and top of the industry partners (McDSP, iZotope, Audio Ease)
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A full environmental system to facilitate the creation of realistic room reverbs.