It helps to start from what the company does rather than from a list of buyer types.
A construction or specialty trade firm with a steady backlog and licensed field staff tends to draw regional contractors that want more crews, more coverage or a trade they don't have. Private-equity firms building platforms in mechanical, electrical or fire-protection services look at the same companies, mostly as add-ons.
A manufacturer or machine shop that supplies larger technical customers attracts other suppliers in the same chain. These buyers care about quality systems, customer approvals and the age of the equipment more than about the brand.
A service company that sells to households or small businesses, such as home services, dental or veterinary practices, or bookkeeping, is often a fit for an individual buyer or a search fund. They want something they can step into and run.
Sale to a management team or a family member is a real option when the next generation is already inside the business. It usually takes longer and needs more seller financing.