For the classic white porcelain farmhouse sinks, the sink itself may be more prone to staining and it will easily show dirt (via Real Simple). Each material used for a farmhouse sink has its pros and cons. Some things to consider, according to design blog Annie and Oak, are that stainless steel ones may be more likely to scratch, and copper or cast iron ones have a much higher price point.
You can't go just on looks and price point alone; you should figure out if you can safely install one. Since they're so big, they're often quite heavy. Before installing, you need to make sure the cabinets beneath the sink are strong enough to support the weight of not just the sink, but the water when the sink is full (via Chicago Tribune).
That's not to say you should shelve your farmhouse sink dreams, just make sure you realize what you're getting yourself into.
