SuiteScript 2.1 Advantages
SuiteScript 2.1 uses the redesigned SuiteScript model introduced after SuiteScript 1.0. This topic covers some of the advantages of SuiteScript 2.1 over SuiteScript 1.0.
Note:
Use SuiteScript 2.1 for any new scripts you create, and think about converting your SuiteScript 1.0 scripts to SuiteScript 2.1. SuiteScript 1.0 isn't being updated anymore, and there are no new features or enhancements for it. Although SuiteScript 1.0 scripts are still supported, you should use SuiteScript 2.1 for any new or majorly updated scripts to take advantage of new features, APIs, and functionality improvements.