I go to each of the three Manly sites - though this is my favourite.
WSS seems to be mainly the old "Im Bored' and General Discussion forum mob from the old MSE. A few of the guys there are younger - a nice group of guys - some of whom have had some falling out with some of the Rockers. (I am oversimplying things of course.)
This site is a mixture of people, many of whom find the MSE site lacking in debate, concerning hard issues relating to Manly.
I don't see that this site or WSS are trying to take the place of MSE (can't expect to) but simply hope to add something for supporters of Manly. There are one or two outspoken fans that post on this site (who are not tolerated by certain members of the Rockers as they are viewed as too negative) who have a record of being banned on the official forums, some for good reason and some maybe unjustly.
My advice - trawl around them all and enjoy!