The big differences are how much the process depends on other people, and the fees involved.
With an estate agent, your property is marketed on the open market, and your sale relies on a buyer securing finance, passing checks, and often being part of a wider chain. This can lead to delays, renegotiations, or sales falling through. You’ll also pay agency fees (often 1–3% plus VAT), and other selling costs like EPC charges.
With a direct cash buyer, there are far fewer moving parts, like viewings, chains, mortgages, and surveys. There are no fees either. You deal with one party, agree a price, and work towards a fixed completion date.
The open market may achieve a higher headline price, but a direct cash sale with no agent offers more control and predictability.