As people have mentioned, it really is what you are used to as to how easy it is to use and understand.
For totally free, there is KiCAD, which if you grab one of the later CERN binaries can be quite feature full (for a free package), especially with their new push and shove router.
For the "branded" free, there is DesignSpark, it is effectively a cut down variant of Easy PC, used it a couple of times for experimenting but never really got on with it that well, the registration email took an hour or two to come through, as did they key email, but once you sign in you can get your key from the web site.
Element14's Eagle is a good package, and they offer a free variant along with upgrade paths, this is of course limited in board size, libraries are very easy to find, and I haven't really found a library part that was incorrect, maybe one or two that needed the solder mask tweaking, but for the most part it worked well.
Diptrace is also a popular one which offers a free and not for profit version with pin count limits, 300 for the free one and 1000 for the non profit free one I believe. I have used this package and it is quite easy to navigate, but I found that the parts library is not all there.
Most will import Eagle libraries and all will generate Gerbers with the free version, you obviously get what you pay for and there is a reason why people are still paying ££££'s for the likes of OrCAD / Allegro and Altium Designer, but I personally go back to Eagle every time as I have the most experience with it.
We use Altium for work and Proteus, which are two very good packages and easy to use, but not cheap.
For a beginner who just wants to make some PCB's I would look at either KiCAD, Eagle or DipTrace, the latter two can be upgraded to "professional" licenses if you choose to stay with the package, Design Spark doesn't have this upgrade feature, so I don't know how well you would get support for it if you wanted to get bug fixes and help, but if you wanted just a hobby and never want to use it for commercial purposes then by all means try DS.
Just my thoughts.
Wilksey