DirectX vs OpenGl ,WebGl?

Question

OpenGL

DirectX or OpenGl if OpenGl then MB WebGl?
OpenGl webGl encountered, taught, liked
DirectX did not try, heard, saw for a long time, it seemed strange =)
Need your advice I know things are not many different
Open cross-platform + browser + phone almost 100%
DirectX market support only a computer on windows well maybe not I know phones on windows 40% of the market if we take all devices
Purpose of the Game
Why I ask this question
1) 90% of games are written in DirectX why? because OpenGl covers a large number of devices, yes, it is inferior in functionality, but no worse (well, as far as I know, it has no serious problems)
2) Yes, yes, I know this is an endless conversation on this topic, but I didn’t find an answer anywhere!
3) What is easier to learn? And the amount of information? I just think that there is more information on DirectX than on OpenGl. There are also many for OpenGl, but %50 or even more is copy-paste!
And so I'm most interested in
1) What is better in terms of graphics and optimization (we take only Windows computers)
2) What is easier to learn?
3) From what will there be more profit in the future?
4) Is it difficult to switch from one to another
5) Well, I will choose C ++ for this language (you can challenge your opinion!)
6) I chose Code Block for OpenGl as an IDE and I think Microsoft's visual will be better for DirectX! (also interested in your opinion)
I ask for your advice opinions on this matter?
What and how do you recommend teaching and why examples and explanations are needed?

Answer 1

Topic closed after creation found many similar topics on this forum
My choice was DirectX