I haven't used the Samsung keyboard in years so I don't know what the comparison would be. I do think that for the most part, FOSS keyboards lag a couple years behind Google, Microsoft, etc. This is one that looks promising, but is still a long way off from a “complete” app.

I guess it depends on how much you care about privacy. There are a number of private keyboards now to choose from, but if you trust Samsung (Google, MS, etc.) with your keyboard data then it may make it worth the upgrade in features