Glad to see that the links are back up (at last)!
There's much to be said about working directly from the command-line, especially in a "proper" command/scripting environment under OS X or Linux (e.g., Tcl, KornShell, etc.). However, both graphical environments offer more than just an "friendly" front-end to the CDP processes. Depending on how you work, it might be worthwhile to try both long enough to feel out what they have to offer and whether their workflow might work for you. In any case, SL and SS are able to run your command-line scripts, so using one of these programs doesn't mean it has to be an exclusive choice.