I'm no expert but I would think Loon would be the best choice given your goal for Nationals and the more competitive atmosphere you mentioned. The extra drive might be worth it.
You might want to post your question in another sub-form (General Chat?) so it gets more exposure from people with more knowledge and experience in competing and the industry. RoxyHoney is a new member and rides for Gnu as an amateur. Perhaps she has good advice for you.
Best of luck!