Cash Flow ratio emphasis on how  cash are generated in and in other words we could say that, it is safety net that it provides to the company. Example of Cash flow ratio are operating cash flow

on the other hand proportion of debt ratio is a type of financial ratio that compute the extent of company’s  leverage. Debt ratio generally measures the total of long term and short term  debt to the total assets of the company

The given statement is correct that,  ratios differ from a firm (e.g., the cash flows ratios indicate high financial risk, while the proportion of debt ratio indicates low risk . because the debt ratio indicate the total debt and its current liability so company can find its leverage position and level of risk that it can take as against to this cash flow ratio simply indicate the cash inflow and out flow during the period. high double-digit percentage ratio will show financial strength, and  low percentage ratio could be a negative show too much debt or weak

From the cash flow ratio one cannot identified financial strength or financial weakness

I generally prefer proportion of debt ratio because with the use of proportion of debt ratio I can identifies so many things like Leverage of the company., financial strength or financial weakness , position of the total debt to its total assets