Photographs show different viewpoints, dates and conditions. They do not establish current access to a particular route. Every image is credited below.
Borneo contains very different forest and river experiences. A boat outing, a canopy walk and a guided forest trail reveal different layers of life. The best base is therefore the one that suits what you hope to observe, not simply the one closest to a familiar island name.
Compare actual locations and transfer chains. Allow several nights in one habitat rather than losing most of the visit to movement between distant areas.