They (Jarreuk) do have a slight advantage here,though Being as their original forum was the only real alternative,to the Jarre.net forum,and always seemed to have plenty of activity when the Jarre.net one was down,and the other thing that swings in their favour at the Moment is that most users of J.Net would not know of this one ,unless you mailed every user....
On the other hand the Jarreuk forum has been known to stand dormant for long periods of time,but only I suppose because of the .Net bustling activity.
And of course at a time when there seems to be little outlet for Jarre forums for most fans they probably will have big inital joining numbers
That said.....Theres nothing to stop people using several forums,and of course its another forum to promote this one on
I for one will Join Jarreuk,but will use this as the main posting one...