Shoninyastube
I Love YTtalk
thank you for ore youre response, i take it in my mind. and after I finished my current projekts and start new ones i will look how i could change some things 

i like the dialect of non german, speaking german. ^^If you can speak English good enough that people can clearly understand, then I say use English. People that do not not speak German but speak English will likely detour for watching your video. If your English is not very good be prepared for the haters. Ich kann auch ein bisschen Deutsch sprechen. Aber Wenn ich ein Videos auf Deutch machen würde, würden die Haters mich kritisieren. I made a video of me driving on the Autobahn speaking German and had to disable the comments due to haters. Mostly German haters due to my dialect and word order.
yeah thats a good point to. thanks SanukuWhile both markets (English/German) are huge they are at the same time already almost overcrowded if it comes to Let`s Play Entrepreneur and therefor it`s hard nowadays to stand out as a Newcomer.
To make it worse it`s nowadays not enough anymore to just upload Let`s Play Videos since everyone else is doing those and the only way to make your Channel look different to anyone else is to go the extra mile and create Content that it unique and everyone wants to see besides your usual Let`s Play Content.
So to answer your Question:
The Language doesn`t matter. What matter is your other Content since nowadays Let`s Play Video aren`t enough to make a YouTube Channel stood out of the Ocean of YouTube Channel that are created every Minute/Hour/Day/Month/Year...