I recently acquired my first flugelhorn, a 1960s-vintage Boosey & Hawkes Imperial. I'll report back on this horn in more detail later, because it has some interesting idiosynchracies, but for now, suffice it to say that it has a lovely open blow and and a beautiful mellow tone (along with some intonation issues that are fairly easily remedied by pulling out the tuning slides and lipping the rest). I use a Bach-equivalent 5c flugelhorn mouthpiece, while my trumpet mouthpiece is a 3c. I'm finding that if I start my practice session on the flugelhorn, doing some warm-ups, long notes, slurring exercises etc., when I switch over to the trumpet my sound seems to be much better and I feel less pressure on my lips. It just feels like the trumpet has less resistance. Could that be because the more open flugel encourages me to blow through the instrument better? Or is it because I'm switching from a slightly smaller mouthpiece to a larger one? Just wondering if anyone else has had this experience?