Consultancy Company where they track  all income and expenditure per client and consultant. A profit and loss is produced through the project and at the conclusion.  Purpose of the P&L is to determine profitability, which consultant manged the project and a history of all jobs for this client.

Would it be better in the above scenario to use Projects or assign all income and expenses to a class and thereafter extract reports.

Is there a fundamental difference between  Project and classes>