Wondering do I realy need that MVS or not?
You don’t “need” it, but it’s much better than Monodevelop. So if you’re doing more serious coding, it is great to have.
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What about - Notepad++ - ?
And also wandering what exactly mean -much better- in this case?
I suggest you begin with Monodevelop, especially if you are new to using Unity, since it’s integrated with the editor.
Visual Studio or Monodevelop, it’s a matter of “like” or “like not”.
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I’m curious what you mean by “integrated with the editor”. Visual Studio is part of the Unity install, and you double click to open code in VS, and you can debug, and so on. It seems to be integrated to the same extent as Monodevelop, but maybe I’m missing something?
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Monodevelop is installed directly within the editor; you don’t need to choose it in the installer. Take a look at your unity install folder and you’ll find Monodevelop. Then launch Unity, go to “Edit/Preferences”, external tools tab and you’ll see that Monodevelop is already selected as the built in code editor.
That said, I’m not sure that “integrated” is the right way to put it but it’s the first word that came to mind when I wrote. “Built in” is probably better.
Since apparently, you have installed Visual Studio, use both, compare and choose the one you like best. 
So a bit more tightly integrated during install I guess. I did start out with Monodevelop back in Unity 3 or so. Hated it so quickly moved to Visual Studio. But I’ve been using VS for years outside of Unity so that’s just my preference. As you suggested, OP should try out both and decide which they prefer.
I had to re-install Visual Studio 2015 (long story made short, I upgraded from 2015 to 2017, but some stuff I needed for a Rasberry Pi 3 I got for Christmas didn’t work so I rolled back to 2015). As it was installing, I wrote some code in Monodevelop. During the 15-20minutes I spent with Monodevelop, it crashed 3 times. Maybe Monodevelop just hates me, but I really prefer Visual Studio’s stability, code prediction and customization.
Notepad++ is what it says in its name: an awesome replacement for Windows Notepad. However for writing long scripts, I still prefer Visual Studio. However if I had to pick between Notepad++ and Monodevelop, I’d take Notepad++ because it’s never crashed on me.
At the end of the day, it’s just preference. Use all 3 for a few hours each and see which one you like.