For the master-slave D Flip Flop like shown above, i wanna hear some recommendations about sizing transistor of inverter, tgate for example, for better performance or power consumption advice.
Thanks very much!

 

The dimensions of transistors are determined by the requirements of the load to the output of the flip-flop. And also greatly affects technology design rules.
Specify your target.
Typically, there is one more inverter (CLK to CLK').