Get what feels and sounds best to you. That is not to say that you should disregard the input of others, but in the final analysis, it's YOUR money and YOUR sound and style. You must decide for yourself based on what you need, based on what you can responsibly afford, and based on what you like when you hear and play it. As you can see, I have no major revelations, so asking me to elaborate on this or other specialized questions will be fruitless. I'm simply not qualified to answer such questions - merely to do research.
Every player is different.
Every single flugelhorn herein is presented in balanced fashion based on information that is availlable, and that is the way it should be. This Web site can serve to familiarize you with horn features, specifications, photos, manufacturers, players, auction monitoring, and dozens of additional links - nearly 200 pages of resource material presented in one location. Note that horn or mouthpiece manufacturers can be surprisingly approachable. If you have a burning question and haven't tried to contact them - shame, shame. Have a great summer.