If you knew for certain that your sim ride was on the Airbus, then choosing the Bus for the MCC is fine.
You might be a tagged student for say EZY then MCC on it makes sense.
Otherwise as a newly qualified CPL/IR hot from a DA42, still requires to gain basic skills which is best achieved using B737, aka “a cluttered piece of junk from the 60’s” as described by 2Unlimited
True the A320 will be easier to fly. But that is not what you want just yet. YOU NEED TO GAIN THE BASIC SKILLS FIRST and not take the easier option just yet with auto trim etc.
Do not waste your money on a FFS. A fixed based sim is better as this stage, as you get no sensation to help you, and therefore must rely solely on your ability to scan.
If you can demonstrate basic handling skills, with good CRM you will be successful.