I just read that Microsoft will no longer support
Internet Explorer for Macs and recommends the use of
Safari. Is Safari compatable with OS 9.1? If it is,
can I download it from the Apple download site?
Yes you can download it (I'm pretty sure) but no, it won't work with OS 9. Safari and Firefox are OS X only.
If not, is Netscape my only option?
You can also try Mozilla, iCab and some others. There's been several questions like this one recently so if you browse down this forum a ways you'll see some of the suggestions.
Why do some people prefer Netscape over Internet Explorer?
I don't have any statistics on this, but I'd say that probably more people went with IE than Netscape. One of the main issues was memory management problems Netscape had. One advantage of Netscape is that there is a newer release that will work with OS 9 than IE, so you won't be quite so far behind. Personally I run IE 5.1.7 and have Netscape 6 for when I really need it.
Can I safely
transfer my favorites to the Netscape bookmarks and
then alternate between the two systems if I
choose?
I can't really answer this one. Some browsers provide features that let you import bookmarks from other systems but I'm not sure which versions of which browsers will let you. You'd have to check that out.
Cheers,
Brian