C++ in Linux or Windows

>inb4 Google, I looked and couldn't find what I'm asking about

Is it better to code C++ programs in Linux or Windows? I'm new to this. I'm just learning and don't want to start off on the wrong track. I'm using Linux btw.

Couldn't you just take the same code written on Linux and compile it on Windows? The only difference would be certain OS-specific differences like window managers, etc., which could somewhat easily be fixed, right? If so, what's the big deal about porting programs to and from Linux and Windows? What am I missing?

If you also have some brotips on better languages than C++, please share them. I want to be able to make all sorts of programs; efficiency is important. My ideal language is one that can do "anything" so that I can specialize in a master race language. Tl;dr Please confirm whether C++ is god tier.

With appropriate libraries like wxwidgets or something and an appropriate developer like Code::Blocks you can do all that stuff in one place.

With appropriate flags and shit you can compile your stuff cross platform through Code::blocks, not try and run cryptic command line GNU+Linux hacker bullshit when you want to deal with them.