Which RC Heli is the best one?

The first and third one look to be acrobatic helis so you will be able to do stunts with them. All 3 are great helis and xheli is a great place to get them. I've been dealing with them for years. If this is your first heli I do NOT recommend getting a 6 channel OR an acrobatic heli. In the 15+ years I have been in the RC hobby, flying was the hardest to learn for me. I bought a 6 channel as my first heli and it cost me about $45-75 every time I tried to fly it. It takes a lot of patience and pre-flight prep to get it in the air....and then trying to control it AND land it takes a lot of practice and patience as well. So if this is your first heli, I would get a 4 channel. But you are headed in the right direction with the ones you are looking at. All are great quality and great RC's. Good luck, hope this helps.