Why is Clock Inverter preferred over Clock Buffer in VLSI Physical Design ?

[@AnandMailaram]

in order to get the same output we have to use inverter again at any end. so we have to use two inverters instead of buffers how does this really saves area

[@EngineerVijitaaDas]

Based on optimization we can use clock inverter and buffer. Not necessarily throughout design we have to use any of them... we can use both in a same design.
To save area, the first buffer is typically of a lower drive strength and is placed very closed to the second inverter. Since different drive strength so pulse width is not same.
Advantage of using inverter based clock tree is that the high pulse and the low pulse width would be symmetrical.

[@sundeepreddy4860]

Can you share some documents to study for physical design