you can try both for free, so why not just give them both a whirl and see which one suits your needs better.
I like to build my web 2.0's for tier one manually for my own money sites. I use autofill magic for this, it really can't be beat if you like to create quality for a low price. FCS networker would be good for this if they would fix their auto login plugin. It doesn't work with firefox, and it doesnt work well with chrome either (I don't like using google chrome). I filed a support ticket about it and they just kind of shrugged it off like there was nothign they could do or would do. Auto fill magic plugin has no problems with this. So I cancelled FCS and stuck with autofill magic.
it really just depends on what you need it for, and what other software you already have. Try them all out and figure out which is really best for you.