Short answer: choose Midjourney Pro if you produce frequent client mockups and many revision rounds—it saves time, gives faster GPUs, upscales, and consistent commercial-use outputs. If you only need a few images monthly, pay-per-use on Leonardo is likely cheaper. Quick test: run one month of Pro, track image count and revision rounds, then compare to pay-per-use costs. For a direct features/costs comparison, see: Compare Midjourney and Leonardo AI