So..I am sorry for my english - It is not my primary language ( I from Russia ).
Let me introduce my first custom pc with water loop. I use computers mostly for gaming but sometimes i work in Visual Studio and Photoshop.
I will answer your questions - why i pick custom water..so i say you - i want. But that's not all. I have a very well temperature..in stress-tests i have 50-53°C CPU and 45-50° GPU - i think it's very good.
Dont read..just see)