I don't specifically use LE, but from what I have read, its pretty much a light version of Logic, so I'm sure its has the capabilities of most DAW MIDI editing. Use of CC messages etc. for starters. GB only gives you a couple editing messages. if you require that stuff in MIDI. Just trying to edit a bar of data can take quite a while. Plus the audio side of LE would be alot more advanced.
GB is generally ok, for a quick composition tool, with some nifty VI instruments to wet your pallet of the softsynth world if you choose to go there. The export import capabilities are just limiting, but hey not bad for a free app. After all it is a stolen(or should I say ported) code of ACID.
T