Pros:

► It uses JavaScript and C# language for scripting

► Unity provides an Asset store where you can buy or find stuff, that you want to use in your games

► You can customize your own shaders and change the way how Unity renders the game

► It is great platform for making games for mobile devices like iOS, Android and Web (HTML5)

Cons:

► Compared to Unreal Engine it has got low graphics quality

► Interface not user-friendly and it is hard to learn especially for beginners

► It requires good programming knowledge as such most of the stuff runs on Scripts.