"The two smart men talked about the trade they had made."
Translation:De to kloge mænd snakkede om handlen de havde lavet.
They are more or less interchangeable. However, it is for some prople seen that two friends "taler" while two business companions "snakker". So "taler" is more personal whereas "snakker" is a bit more professional. This is only a small detail and not something that is widely used in practice.