What is a good microphone for video recordings, that will work both on my iPhone 6 and my PC? I'm creating videos on YouTube and everyone complain on the audio quality
It really depends on how much you can afford to spend. A pro setup would involve something like an Apogee audio interface (http://www.apogeedigital.com/lightning). That can be connected to the iPhone via a Lightning cable and the computer via USB. Then you need a good quality XLR microphone like the Shure SM7B. If that is out of your budget, a good option might be the Blue Microphones Spark (https://www.iclarified.com/entry/index.php?enid=19201). I believe it has now been updated with a Lightning cable (http://www.bluemic.com/spark_digital/#/specs/).
Thank you. Of course im looking for the cheapest setup that will also be good for the price. I will have a look on those links when i get home, the iPhone app is stupid and will not open the link/copy it...
Blue Microphones lists the Spark as supporting up to the iPhone 5s so you might want to double check with them on iPhone 6 support (just to be safe). Amazon has it 25% off from $200 to $150 and it's currently on sale at checkout for another 15% off that making it around $127.50. http://amzn.to/1Am4O3k
"Audiophile" and "Bluetooth" are terms that should not be used together, unless bluetooth is being used for file transfer only. Bluetooth sound forwarding is lossy. I don't know any audiophiles who would use Bluetooth speakers directly.