They both have basically the same meaning. I would argue that: 1. Enough is much more informal and much more common 2. Sufficient tends to be a bit more formal and maybe professional 3. You can use enough on its own or with a noun. I have enough/I have enough money 4. We can also use enough with an adjective It is big enough/It is hot enough

Sufficient and enough are synonyms. However Sufficient is more abstract. Your work was sufficient. Do you have enough towels? Yes two is enough. We use enough 25-1 over sufficient. Native speaker of English in the US.