Should I go for a part-time PhD?

Is it a good idea to pursue part-time PhD? I have gone through websites of many universities in UK promising that there is not much difference between full-time and part-time doctoral programme they offer. But it’s just that I do not understand this distinction made by the universities between the both. Can anyone advise if part-time PhD is a good way to go for? Do these courses follow the same coursework and other thesis submission and defence procedure?