When to use Visual Composer

Hello,

I am little bit confusing, as said in the Netweaver developers guide, VC is used in less complex applications and Web DynPro in more complex apps.

So, How one can decide which is less complex and which is not??. How to measure the complexity and in which terms??

How to decide between webdynpro and VC??. How far it is successful, VC??.

Thank you very much for the help.

Regards,

Raj.