I'm currently using IntelliJ IDEA, but I'm thinking of moving to WebStorm.
Per your experience, which would be more suitable for nodejs development?
Yes web storm is the most suitable editor for development with node js. Personally however I don't find use of most of webstorms' features.What I look for in an editor is simplicity,minimal interface and quick opening of files.Having said that intelliJ IDEA would work fine with node js as well.Since it is just javascript.
Currently I am using brackets and text adept interchangably.Both of them are free and you should give them a try.
Edit
For intellisense support in node js there are following options