Native Instruments product does seem to be the way to go, but I am a bit confused. I looked at Kontakt as I already have some libraries from Spitfire audio and Sound Iron. Then I looked at Komplete 13 Select. Would Select 13 play the libraries I already have or do I need the full version of Kontakt as well.

I have not used the libraries mentioned in a few years so do not have the Kontakt player I used previously installed.