SiteGrinder it’s a good plugin to have but the site samples are kinda sparse as far as quality sites built using it. The flip side is that the coding is sloppy and it’s not very tailored in it’s design approach. You don’t have much control over every detail and making any custom edits or changes will require you to do them in Photoshop. The nice part about Freeway is that you can output HTML files and then have them be opened in Dreamweaver or any other popular HTML editor and be changed easily.
I’d put RapidWeaver as the easiest, then SiteGrinder, then Freeway, and then Dreamweaver on your list of web page software ordering from simplest to (somewhat) complicated.