N.I Kontakt is the best one of samplers because has an integration with each instrument loaded in Kontakt and it's good because don't causes a blow-mind on use; I recommend..
This plugin can be a good solution for beginners because it's easily to use and.. my tips for use this plugin is adding reverb with all mixer channels playing.. to hear the difference and control the reverb flux..
The Serum is good because, it's easily than other wavetable VSTs.. and the combinations possibility with Serum is incredible!! The controllers and the FX table has been an innovation in my opinion;
MASSIVE have an complexity to work but.. it's good.. because it's have unique sounds.. and very good to make bass sounds and unique leads with your style;
If you searching an library to your music, choose reFx Nexus, because, Nexus is the most complete VST library with thousand of sounds can you use for your track;
