if you look a the (sample) contents then the pro version has more to offer.
For me mainly the way of working with pro is much better and leads quicker to a better sound then the light version for me. Light has no dynamics via cc1 for example, and alltough there are workarounds, this is exactly what then is needed, you work in other ways or have to implement tools, .... and then still I have a better sound with pro then with the light.
All in all, if you have the funds for pro, that is the better choice in my opinion