Autocad Plant or Revit - What program do you use to draw plans and diagrams?

Dear Engineers,
Please let me know what is better, Autocad Plant or Revit?
I am going to draw there the ammonia refrigeration plant with glycol installations (general drawing, PID, isometrics). At the moment I am using AutoCad (with Visual Basic addition - to add the valves, specification, etc). The General drawings, PID and isometrics are made separately. I want to buy a program to make 3D drawing.
If you have experience with Revit or AutoCAD Plant 3D please give me feedback.
Please to not spoken to people who do not have contact with the design.
Best Regards,
Artur

Dear Artur,
Sorry for my bad english !

Currently, we work with autocad Plant 3D and P&ID.
We use plant 3D for piping and P&ID ... for P&ID. We do industrial refrigeration engine room (R717 / CO2 / glycol ...).
AP3D is for piping and Revit is the building.
I have associate a SQL data base to P&ID to import our standar material. A tool permit us to make reports for bill of materials etc etc
Regards

Thank you very much for your answer.
It is useful for me.

Please let me know:
1. Do you generate isometrics by AutoCad Plant 3D?
2. Do you have Danfoss cautalogs for AutoCad Plant 3D?
I will be very grateful if you send it to my e-mail adress.
If you have any other catalogs, please send it also.

Below is my email address:
arturzuk87@gmail.com