Re: Zuken or Protel
I have only experience of Cadstar out of these 2, and for support and library I can say...
If you are on the annual maintenance then you do get some support when you need it, you can have your files fixed when they get corrupted etc which is usually OK.
Library wise, there is a big collection of libraries available online at Zuken, however I have found that component manufacturers websites never provide Cadstar footprints but do sometimes provide Protel footprints for components.
All PCB programs will be hard to figure out until you are used to them, I dare say that I would be really puzzled over how Protel works. I do see more people able to help others with Protel so I assume that it is the more popular of the 2.