Magneto gas have been around forever. They just take a little extra care to set up the radio equipment as to keep rfi down. They can be a little more tricky to start when cold, unless you get one that has a mechanical advance, then they're not as bad.

The EI motors, now they're sweet, and are the reason I will probably never go back to magneto. 1st, I love having the ability to put an optical kill switch in. They're also generally very easy to start, idle beautifully and transitions are awesome! I also love that I can mount my ignition battery, throttle and choke servo's etc.. all right next to the motor.

I don't think anyone logically can say one is better than the other. It's just up to you.