Historically, each annual SolidWorks release begins at SP0.0, followed by approximately five or more additional service packs. These service packs include fixes to various user-reported issues, delivering an overall more stable and reliable user experience.
While later versions have added "bells and whistles," 2019 introduced workflows that are now industry standards. By SP5.0, these features work flawlessly. SolidWorks 2019 SP5.0 Full Premium