the one with ailerons will be alot easyer to fly for starters,when I started RC in about 1977 the falcon56 was my first RC plane, what I did was to build it with ailerons at the suggestion of the local hobby shop(LHS) since I had a Kraft 4ch radio.
what I found out was the little 1"strip aileron that the kit recomended making, did almost nothing to contrl the plane, and the gent helping me out at the time made me add 3/4strips to the trailing edge after the first flight telling me you will never learn to do anything but put around the sky without working ailerons.
there are many who started flying the elevator rudder controled planes, but you will find the (full house)thottle,rudder,elevator,and ailerons to be much more controlable and easy to fly plane.
if your dad has never flown any planes without ailerons he's in for a pleasant surprise,just make sure there even with the trailing edge and it will fly like the clasic version only better.