Nothing beats the sound of twin electric motors spinning in sync!
I can't comment on the Skywalker because I don't have one, but Twin vs. Easy is no contest, frankly. Don't waste your time even considering the EasyStar. The EasyStar is a light utility plane that can carry a moderate amount of cargo/weight. People use it primarily because it's easy to fly. Since you can fly 4 channels, you would sacrifice way too much to use it.
The TwinStar, properly configured, is a heavy lifting plane. You can increase its cargo volume to cavernous levels. I can fit 6
2200 mAh 3S LiPos in mine and I still have empty space! And it can haul weight like no plane I've ever seen. I flew mine at 60 oz and it climbed at at 50 or 60 degree angle. Empty weight is 33 oz. That's almost double!!
No way you're going to get the combination of weight-lifting ability and cargo volume with the EasyStar. I suspect the same is true of the Skywalker.
I am very impressed with the TwinStar and would highly recommend it for your application.