From what I remember from earlier experience with Redhat distro's, there was an option to choose between KDE & Gnome (if both were installed), in the graphical login screen.
About your second query, check the fedora faq in this section, it has the answer.
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How is Fedora compared to other LINUXes ??
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Well you are using it, so tell us
different people have different views, I personally did not like fedora much, but I know many who like it a lot. If it works for you, thats all that matters.