Farm-raised salmon basically means that they raise it to be sold and eaten. In a controlled environment, the salmon is raised and sold to be processed. Wild-caught salmon basically means that the salmon is caught in the ocean during the prime months of summer. You can use either type of salmon, but it might be harder to find wild-caught depending on the season. The flavor of wild-caught is going to be much better, but more often than not, you will pay a heftier price. Ultimately, wild-caught is a better choice but isn't always readily available.