Don't know how relevant these statistics are, but the Unreal subreddit has around six times the users of the Unity subreddit. I've always found it much easier to find help for UE4 than Unity.

Granted I've run into a few bugs in UE4, but then again it seems to include a lot more features out of the box. Lastly a lot of people seem to appreciate having the source code available which I don't believe is the case for Unity, as least last time I checked.