- It lets you select all your own settings.
What does that mean? I can already select Low/Medium/High/Very High, etc so isn't that the same thing as selecting my own settings? Why would I need to select Custom? Exactly where would I "customize" it anyway?
When selecting custom, you can individually adjust each type of detail, essentially mixing and matching low, medium, high, and very high details. The low/medium/high/very high buttons are presets for setting every kind of detail at the same level, whereas custom lets you make some low, some medium, some high, and some very high.