In my opinion...
The best software is Cadence SPB I have ever used for RF-Microwave and for other applications in terms of accuracy,scalability,flexibility,compatibility.It's also very user friendly and last version is direct linked to ADS to simulate the PCBs.
But more accuracy is required for mmW applications (beyond 20GHz) AutoCAD based softwares are quite popular.
But in this case, Cadence IC layout editor is also used for this purpose..
There are many objectives to be considered..