Nero Express is a trimmed down version of Nero. it has less capabilities than the full Nero.
basically, it has a more user-friendly interface, especially for people new to burning. very simple process, step by step, for creating various CDs: data, audio, video etc.
however it is lacking some features that more experiences users can't live without.
some drives come with Nero Express rather than Nero, apparently it is cheaper for the drive manufacturers.
if you have the full Nero you have the Express too (you can switch between the Express interface and the classic one as you wish), but the reverse is not true.
if you can get the full Nero, that is the better option!
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien