I think it depends on your own personal demons, and what you would like to achieve. I've tried both WW and SW and both worked, however I found they were unsustainable for me because I like to do the least amount of work I have to. They WERE both easy, once I already had points or syns values for everything.
I currently calorie count because I found that if I'm truly going to keep it off forever, and live my life like this, then I need to know actually what is in everything I eat and how much of it I should be eating. People tend to hate the idea of logging everything you'v eaten right down to the last calorie, but you fall into a rhythm after a while and it becomes easier and less tedious. I'm also quite active and so I found calorie counting was easier because it allowed me to take control of my sports nutrition much much easier.
the only thing I could never do is meal replacement. Whilst they give fast results, the weight loss to me seems unsustainable and you eventually have to come off of them.
I don't think I explained myself too well, but I hope I helped! =)