Choise of a process would depend on what all factors?
I am sure the what we are designing would be most basic, along with electrical parameters for that design.
Assume if we need to design in weak inversion i.e ultral low power design how would one start?
Check for the process parameters like supply voltage, ft and then check the cost of the process. If you can achieve your design requirement with low ft process, then no necessary for going to high cost process, with help of bandwidth extension method and so on.