What would be the benefit of switching to ANTLR 4 as a parser generator?

Due to the lack of significant improvements of JavaCC over the last years, I got the impression one should think about a switch of the parser generator.

After playing around and testing a bit of ANLTR 4 I am quite impressed about the easieness to transform and improve JavaCCs JSQLParser grammar to ANTLR 4. Still there are some things to solve:

• keywords as identifier: solution would be like now
• deparsing has to be separated again since the tree node classes of ANTLR could not be provided, like in JavaCC but are automatically generated
• tooling around JSqlParser should be rebuild (e.g. TableNameExtractor)

But there are significant improvements automatically at hand.

• ANTRL 4 generates listener and visitors for the parse tree.
• semantic predicates to disable rules
• the grammar is much easiear to read
• automatic operator precedence

I appreciate any comments to this.

Maybe there is another generator at hand that would be even better to use.