Frankly, it’s not possible to answer at your question. If you work as a property manager the task is not to find the best channel manager, but analyze market and choose one, which will satisfy your definite requirements, match your tasks and market.
Below there are few aspects, which you have to consider before choosing appropriate channel manager.
A country/city, where your property is located. There are an OTA/vacation rental portals, which are leading at any markets; Southeast Asia and U.S. have a different leaders, except worldwide platforms such as Airbnb, Booking, etc. The same situation with channel manager; overall the local players (channel manager’s developers) are better understand what their local clients need and which channels are most important for them.