Help with iPhone 5

Hi everyone,

I have had my iPhone since January this year, but I have decided to jailbreak it. Its currently on 6.1.4 but I am willing to wait until untethered Jailbreaks are available for the firmware. I was wondering, which jailbreak method should I use, redsnow, evasion, greenpoison? And also the main reason why I want to jailbreak is so that I can use a file manager on the phone and download(especially youtube videos) whatever I like onto the device while also using it as a mass storage device. Can I download youtube videos with Safari download manager?

Thank you