Redhat's free Linux is now Fedora Core 2.
If you compare Fedora Core and Mandrake, then FC is much more agressive to push new versions of everything in, play with the kernel if they think it is the right thing, and change quite a bit of software''s default settings to be easier or new users.
Mandrake ships more stuff in what is the original developer's intention and is far less aggressive with new version, much less incompatible changes.
FC2 works very well for me, although I will install a standard kernel and I change all the defaults in applications to what I want anyway.
Another huge advatage of Mandrake is that they ship with a utility to resize NTFS so that you can install on a harddrive full of NTFS.
As good as FC2 works for me, as many problems a friend had who's preferences are different. I want newest everything, I change every default setting anyway and I want to get involved, which is possible with FC. My friend just wants a working notebook without any fiddling, and the startup scripts failed pretty badly for him.