Adobe Illustrator CS4 and Adobe Illustrator CS5 which …

Adobe Illustrator CS4 and Adobe Illustrator CS5 which version of the easy to use? My computer can not be two versions of security, only security a, Ai CS4 and Ai CS5 security which good?

I am not good with cs4 cs5 actually used their some of the features are almost all within the same version of the update is just a bit

always feel there is no new version of the old version of the stability of the

which can be used very easily familiar, but there must be adaptation period

I also installed two versions, of course, are the green version, no problem!