I will say that it is impossible to compare apples and oranges. I really see no use for a trumpet with a flugel mouthpiece. I have never had a playing gig in 45 years where something like that would have even been interesting. A flugel with a trumpet mouthpiece is common in Germany for certain types of military wind ensemble. In those arrangements, it is purely brass and the rotary flugel players get the clarinet parts. They would be no fun on a deep Vee mouthpiece. The trumpet mouthpiece in a flugel is a DESASTER in a jazz setting.