Hi,
You are right, it’s not possible to find this kind of comparison.
In general, you can use more tracks in Elements. There is more Instruments and Effects. There are 8 slots for plug-in effects instead of 4 in LE.
To create a vocal harmony, you need Cubase Pro.
Btw: If you upgrade now, you will upgrade to Cubase Elements 8, so you will get everything, what is new in this version, included MP3 export, ChordPads, etc.