CodeSourcery give you free toolchain but you have to pay for debugger and Eclipse IDE support. FSF is free (as in freedom !)
CodeSourcery are the official maintainers of the ColdFire and ARM ports of gcc.So their versions are always ahead of FSF versions but FSF versions are more stable. (if you want to be able to compile your ColdFire code with a "-mcpu=5213" flag for the MCF5213 processor, you can download CodeSourcery's binaries or source tarball now, or you can wait a couple of years for gcc
4.3 to be officially released. )
The free CodeSourcery tools have pretty much the same backend as the next version of the FSF tools will have, while the subscription versions have the same backend as the version after that (the frontends are all much the same, although some CodeSourcery developers work on the frontend and middle "end" too).
Using CodeSourcery you can get professional level telephone support rather than just mailing list support (FSF).