When comparing ECMAScript 6 vs Amber, the Slant community recommends Amber for most people. In the question“What are the best solutions to "The JavaScript Problem"?” Amber is ranked 27th while ECMAScript 6 is ranked 37th. The most important reason people chose Amber is:
Amber includes an integrated development environment with a class browser, workspace, transcript, object inspector and debugger.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro New features make JavaScript a bit less painful to use
Pro Includes an IDE
Amber includes an integrated development environment with a class browser, workspace, transcript, object inspector and debugger.
Pro Smalltalk is a simple, elegant, and powerful language
Pro One-to-one JS equivalent
Amber is written in itself, including the parser and compiler, and compiles into efficient JavaScript, mapping one-to-one with the JS equivalent.
Cons
Con Undefined
JavaScript's fundamental flaw. ECMAScript still has it. Instead of crashing at or near the problem with a helpful error message like any sane dynamically-typed language, it just returns a garbage undefined
value until it finally crashes in some other unhelpful location. Or worse, it doesn't crash at all and just doesn't work.
Con Even more complicated
One of JavaScript's primary problems is that it's too complicated. Adding even more features is not going to fix that.
Con Very few learning resources
There are very little learning resources for Amber outside the official documentation. Which may not be enough for beginners, especially people that don't have much experience in programming.