For facebook and instagram you should use facebook creator studio. It is free, you can plan upto 6 months in advance and it’s the only thing facebook wants you to use. There’s no benefits of using other programs for these two, except for story posting. However, I would suggest you post stories manually because you will see a huge difference in the reach. I think using creator studio shows their algorithms that you’re professionals while the manual story posting shows them that you’re there and not away. I might be wrong but it seems that this mix of both gave me the best reach.