There is no single “best” rangefinder that would be universally suitable for all users and purposes, as different rangefinders are designed with different features and specifications to cater to specific needs and preferences.
Some popular rangefinders on the market include the Leica M10-R, the Fujifilm X100V, the Sony RX1R II, and the Zeiss Ikon. Each of these rangefinders has its own unique strengths and weaknesses, and the best choice for you will depend on your individual needs, preferences, and budget.
Factors to consider when choosing a rangefinder might include the lens quality, resolution, autofocus speed and accuracy, size and weight, battery life, durability, and price. It is also important to consider the type of photography you plan to do, as different rangefinders may be better suited to certain types of photography, such as street photography, landscape photography, or portrait photography. Ultimately, the best rangefinder for you will depend on your own needs, preferences, and priorities.