I have helped a lot of people start up. I always make my choices based on how they throw. On average you can never go wrong with a Comet its a straight shooter, and shows you their throwing style naturally. If they are hyzering a lot I then recommend moving to stratus / glide / Meteor.
If they are anhyzering a bit, then move them over to a Rock / Buzz / Orc.
They beauty of disc golf is the many disc and styles of throw. So that's the best I can offer with out witnessing the shooter myself.