How does Modern Warfare 2's multiplayer experience differ from 2019's Call of Duty?

Call of Duty: Modern Warfare 2's cross-platform beta testing phase is now live, and players on PC, Xbox, and Playstation can finally play the beta together.

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Call of Duty®: Next: Call of Duty®: Modern Warfare® II Multiplayer Brings the deepest, most innovative MP experience yet

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How does Modern Warfare 2's multiplayer experience differ from 2019's Call of Duty?