I agree the Nexstar will be easier to learn on, but the Mustang will be more fun down the road if you don't crash it trying to learn. The Nexstar comes with a great engine, and many people are not a fan of the Evolution engines that come with the H9 planes. I believe the radios are of equal caliber.

It's nice to have a high wing trainer around for a relaxing flight.

If you get the Nexstar RTF, don't use the automated leveling device (I forget what it's called). I used the wing droops and speed flaps for the first day, and I found them helpful to slow things down a bit on the first few flights. Then I took them off and enjoyed the more sporty feel of the plane, which isn't really sporty at all.

The Nexstar can really take a beating.

Most people have at least a couple of planes, so starting with the Nexstar and getting a Mustang for #2 is very reasonable. That is the route I suggest.