You are writing a comparison of an all-equity structure to a levered capital structure for a firm. It is accurate to state in this comparison that:
earnings per share will always be higher in the all-equity structure.
firms will only select the levered structure when individual rates on borrowed funds are lower than corporate rates.
leverage lowers shareholders' returns in bad times.
the all-equity firm has a greater advantage the higher the firm's earnings before interest.
leverage improves shareholders' returns regardless of the firm's level of earnings.