Flying wings generally are touchy in pitch control. Unless the plane is made of a material where it bounces instead of breaks... that leads to a demolished plane really quick for a beginner. The Zagi bounces, so you can make a lot of mistakes without destroying it.

Flying wings also get at angles where they can nearly dissapear (wingtip toward you) or you can't tell which way the darn thing is pointed. The conventional aircraft its much less likely (though when the get far away and with bad color choices... it can be hard to see if its comming in or going out)

A beginner needs every advantage he can get...

Good color contrasts with defined difference between top-bottom and right-left
Stable design
Properly trimmed
Reliable power
strong airframe
a decent instructor