I've trained plenty of students using both of the those planes and they both fly just fine. Of the two I prefer the Hobbistar because it is cheaper. The Nexstar has some extras that you will pay for but will end up not using, but it does come with a flight simulator that will help you to practice at home when you're not at the field. But as far as flying goes both trainers are good flying planes and will do just fine for you to learn on.

Hope this helps

Ken