assuming you mean foamis vs larger electrics... Actually the larger birds (80"+)are as easy as the foamies to 3D, even easier (just don´t tell anyone ) the hard part is in your head... lot´s of monay dangling 3" of the ground...

[link=http://www.henke.rchomepage.com/video/promotion1.wmv]3000watts flown foamiestyle[/link]