They are on exactly the same network. BearShare would give you a slight advantage in
performance because it is built for Windows and not a Java program. It also allows you to see
more information about the sources, making it easy to spot fakes and misnamed files.

For subtitles, run a parallel search for .sub and .srt files. Also don't forget to browse the
sources where you found the movie. If the filename before the .srt or .sub is an exact match to
the movie it is probably timed correctly.

There are also several web sites that specialize in subtitles. Start finding and bookmarking
them all and they'll be handy for the future.