We do not recommend using any scheduling tools, except for Tailwind.
However, also for Tailwind users we always recommend manually uploading the pins to Pinterest first and using Tailwind in the second step for scheduling out repins to different boards. The reason is that Pinterest wants you to use the platform for uploads.
That being said, if you feel that a scheduling tool would support you in saving time, we encourage you to try it out. Feel free to also compare the performance of directly uploaded pins with indirectly uploaded pins through the scheduling tool. Our experience has shown that directly uploaded pins tend to perform better.