When you're searching for homes, it's better to look to local websites rather than national websites. Why?
National websites tend to focus on a bigger geographic area and the data is not as specific as the data you'd find on a local website put out by a local agent. You'll also find a lot of advertisements on national websites, which is where a majority of their revenue comes from. They also generate revenue by selling your information to third parties.
When you look at local websites, you won't have to put up with advertisements and you don't have to worry about your info getting sold off to any third parties. The information you provide is used by the local agent to contact you and give you whatever information you're looking for.