Converter video files

[NNesin]

So, I plan to put video's on my iPad from my PC through iTunes.
But, I've heard so many different converters i'm lost now. What is the best converter to preserve the best quality of the videofile?

 

[Menneisyys2]

So, I plan to put video's on my iPad from my PC through iTunes.
But, I've heard so many different converters i'm lost now. What is the best converter to preserve the best quality of the videofile?

1, remuxers if your source file has a H.264 video stream

2, Handbrake if it doens't