Are you looking to start a war? Do you want the truth? Why would you expect a Liberty owner to brag about a Marathon? (Except for Mango).
All kidding aside I will admit to a strong bias toward Liberty and in favor of over the road air. But in the used coach market what you are looking for is not the most common coach in the world and you are not going to be presented with a lot of choices. Just do not limit your options as you are doing unless you have no choice.