a.l.b may not have as many readers as c.l.b.m because many
corporate/government sites do not carry alt.* groups.
However, this is a moot point in present times because there're only
ten or a dozen participants left on USENET these days anyway. :-)
alt.* groups typically carry more *** than the Big8 groups, but
saying that is a bit of an anachronism because these days all
newsgroups carry much more *** than information. As a fine example
of this, you need look no further than comp.lang.basic.powerbasic in
its present incarnation.