What's your criteria for "best"? Speed? Reliability? Code refactoring smarts? Code intelligence/autocomplete? Biggest community? Largest number of options? Largest collection of extensions? Cross-platform support? Ease to learn vs long term ease of use?
JavaScript is probably the most broad in terms of options - you can use anything that edits text. The problem is you can use anything that edits text, so people use anything... ;) But the focus then is the code itself and often the smarts like code quality have been pushed into generic build tools (eg. at work we autorun ESLint and Flow in terminal, not in the editor/IDE).
Languages like Java and .NET tend to have fewer serious options, but generally you end up with everyone on a team using the same thing. Shared knowledge is pretty useful. Of course that also means your team tends to get really stuck on the paradigms of that tool rather than the code. Also the more closed the ecosystem, the more chance the tools cost a LOT of money (.NET can get shockingly expensive, depending on the extensions you need).
DX is about a lot more than the editor/IDE, probably a whole other question really.