The Zenoah is the better all around engine.

The real question is which is the better buy.

If you fly around at 1/2 to 3/4 throttle it doesn't matter who makes more power.

This spin off motor is a good motor. It makes good power and replacement parts are cheap and easy to find.
They tune good and start easily.

You will probally fly it into the ground before you wear it out, or at least I seem to.

For most people I'd say save your money.