Newcomers seems to be quite a mixed bag. Quite a few are new to recovery, but many also have problems other than alcohol to deal with, so I guess the alcoholism forum might not be a useful as some of the others. There also seem to be a good number of longer term problem drinker members who seem settled there amongst the newbies.
The alcoholism forum seems more focussed on alcoholism, as you might expect, and perhaps a little more solution focussed.