Atom / VSC - code completion

Hi.

Currently i use Netbeans as my main IDE, however recently i got frustrated with the amount of background scanning it does.

I'm eyeing Atom and Visual Studio Code editors to see whether one of them can replace Netbeans for me.

The functionality i need and i have trouble setting up for Atom or VSC is the following:
- code completion (i can't get any of them to autocomplete classes and methods either for CI3 of for CI4)
- format on save (psr-2 works with plugins using php-cs-fixer), but i would like to tweak it to format according to  CI3 or CI4 style guide.
- navigator panel to show the method names within a class would be handy

So my question is, do you guys know any plugins or settings that would help me achieve the above?