While original replacement filters for refrigerators are of top quality, they are costly. Third party filters like Waterdrop filters are cheaper, while not compromising on the quality of the filter.
Best water filters are those that remove the contaminants that you are concerned most about. For instance, if chlorine odor and taste are the main focus for you, using a system like Waterdrop filter is ideal. Another good choice is EveryDrop Filters.