A single number on one page is impossible to compare. A useful quote states four things.
Coats. Two over sound paint is standard. Three over bare plaster, patching or a light colour over dark.
Preparation. If crack repair, sanding and priming are not listed, they are not priced.
Products, by name. Coastal walls, wet areas and roofs each need a different system.
Exclusions. Roof coating, structural repair, rendering and rot are separate jobs.