Ubuntu Fedora and Mint seem to be the most approachable to new starts.
Personally I like Fedora, though really between the 3, the experience besides desktop environment is comparable, and you can install whatever desktop environment you want.
Ubuntu and its flavours appear to have the best driver support, and more crucially, more people asking similar questions and so it is a more welcoming first step, you can always change later as many end up doing once they know the ropes.
Some small advice, if you want to learn linux, you have to use it. Dual booting and sitting primarily in windows wont help, try if you can, to use it as a daily driver for a month. That should be sufficient to get comfortable.