This is intended to answer a question Casey Muratori had on twitter about why would anyone choose Unity over Unreal. The short answer is, I have no clue. Well, I kinda do know why you WOULDN'T choose it, so maybe I'll tackle it that way, pros/cons. Read on.
There's a few pros I could think for Unity:
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Their text-based asset serialization which makes collobration work and resolving conflicts much easier. Unreal's assets are all binary and it's really built well for Perforce, if you're more than a handful of people working together not using Perforce (e.g. git) you'll have a less of an idea time.
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Their undo/redo system I found is a lot more graceful/lightweight than Unreal's. Undoing in Unreal sometimes doesn't work reliably or go back a dozen entries in history, and just reverts back your selection state and is a bit intrusive (not sure if that was imporved in UE5)
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Their animation editor (for me as a non-animator) I found was friendlier and easier to work with
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The profiler is nice and very easy to us