I am not sure what differences there are, if any between the HPS and JTS version.
Someone can correct me if I am wrong on this. There are no JTS version updates because the JTS version was created after the last set of HPS updates were released. Because of this, the JTS version should include all of the updates automatically in the download.
I would highly suggest getting the JTS version.
If any future updates do get released, you will have them available alot sooner for the JTS version than the HPS version.
If you want anything official, contact JTS support and ask your questions directly to them so you are 100% confident about your purchase.
Here is the email address to JTS support:
[email protected]