The two platforms are redundant of each other. Both are content creators and schedulers with Social platforms. If you are going to invest in another software besides a good SMM software. I would recommend researching a powerful Social listening partner or content recommendations partner that enables you to pick industry trends and data based off the needs of your clients.
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PromoRepublic has one major flaw. It is not connected to Instagram. I would suggest going with Hootsuite. Or another SMM platform that can post to Insta.
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Fanpage Karma I am not familiar enough with to provide feedback on. However, when we were picking our resources. We ultimately did not even have them pop up in any recommended SMM tools. They might just be too new.
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Source: I am building a SMM company that manages businesses Socials and makes content “with” them. This is important to differentiate. Not “For” them. But “with”.
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Good luck on your journey! He sounds like he is on the right path. However, there are many things to think about. And many agencies find themselves unable to effectively do this service for their clients. Thus why many stick to SEO and Ads. Their clients understand the ROI and there is less stress on a continual basis.