In an Enterprises that is also implementing CE, what would be the best way for Cash flow statements, FSG or form CE? Thanks.

A pure Cash flow statement describes the change in cash position between the two balance sheets.It is prepared using FSG reports just like Balance Sheet and Income Statements.
Cash forecasting reports could be run from Cash Management module. Forecasting predicts the cash position in future. It takes into accounts Payables Invoices, Requisition, Receivables Incomes, Sales invoices and so on. These transactions have an impact on cash in the near future.