Pioneer VSX-1021K VS. Yamaha RX-V671 (HELP)

Hello guys! - Writeing from Denmark, hope you understand me

I'm looking for a new receiver, and it gonna be one of these: 

Pioneer VSX-1021K

Yamaha RX-V671

Yamaha RX-A710

 - The receiver will be used 80% music, and 20% movie, so the receiver shall be good to stereo!, and I'm not sure which one there are the best there?! The Pioneer have Airplay, and that's is a +, but the Pioneer is only offering 1 years warranty!

On the paper is it the Pioneer there are the most powerfull, but I'm not sure which one who are the most powerfull when it comes to the end.. 

I hope you guys can help me, and maybe give them som +/-

Greetings Marco