welcome mate.

Different forums offer different things, or a place to be if one of the others doesnt suit you as much - a different "feel" if you like.

No so different - look up and see how many car forums there are, or pick nearly any other hobbie. Sometimes different people get the same idea at much the same time. Heaps of gen watch forums as well

I am also a member of the others, but really spend most of my time here.