Dear friend,
Answering to your questions:
1- To choose a device for your design you would have to answer to the following questions:
What is the voltage supply you have available
Do you have a negative voltage available (to bias a GaAs FET)
What is the maximum current available for the amplifier
What is the operating temperature range for the PA
2- Now for the type of implementation for the matching circuit the questions to be answered are:
What kind of substrate you will use to built your PA on? This answer has a straight connection to the budget for the design.
What kind of physical real estate you have to layout the PA.
For example, normally when you implement a circuit in microstrip line you are aiming productivity, because in the assemble process the components to be placed on the boards would be a minimum, once you have a PCB mask basically corresponding to the circuit's components. What you pay for that is: board's real estate (mainly at 2.5GHz) and the necessity to use an expensive microwave substrate.
By the other hand if you choose to implement the matching using lumped components, you would have more labor in the production process, but the board`s real estate used would be much smaller than in the previous case and also you could use an inexpensive substrate to built the circuit.
Sorry for all of these considerations but there is not a straight answer to your question.
NandoPG