What are the differences, is it just the difference of sample library content, or is there a difference in features? I’m mostly just interested in loading in my own sounds and samples - so I’m not to worried about not having the full content pack.
For Groove Agent you can have up to four kits in the instrument in the full version, useful for mixing acoustic and electronic kits.
As for Halion, do you mean Halion or Halion Sonic vs Sonic SE? The SE and full versions of Halion Sonic are sample players whereas the full version of Halion is a fully featured sampler with enormous editing capabilities for both sounds already recorded and your own samples.