Choosing the "best" fish finder depends on several factors, including your budget, the type of fishing you do, the size and type of your boat, and the specific features you need.
Budget: Fish finders vary widely in price, from relatively affordable entry-level models to fully-featured high-end units that can cost hundreds of dollars or more. Consider how much you're willing to spend and prioritize the features that are most important to you.
Display Type: Fish finders typically come with either color displays or black-and-white displays. Color displays offer a more detailed and visually appealing view of the underwater environment, but they tend to be more expensive.

Frequency and Beam Angle: Fish finders use sonar to detect fish and other underwater objects. The frequency and beam angle of the sonar signal affect the range and detail of the information you receive. Higher frequencies provide better detail but have a shorter range, while lower frequencies offer a longer range but less detail. Some fish finders offer dual-frequency or multi-frequency options to provide the best of both worlds.
GPS: Many modern fish finders come with built-in GPS, which can be used to mark waypoints, create routes, and display your boat’s location on a map. This is especially useful for navigating unfamiliar waters or tracking progress on a fishing trip.
Different brands of fish finders offer different features, so it’s worth taking the time to research and compare various options to find the one that best meets your needs. The "best" fish finder will depend on your specific requirements and preferences.