I've recently returned to trumpet playing and started back on a 16C4. This was relatively large and, although good, wasn't as bright as I wanted for blues.
As I'd played a 3C mouthpiece before then this 14B4 looked like it would fit the bill. It's spot on. Slotted straight in. Very comfortable and helps me produce exactly the sound I want with a bit of sizzle.
Definitely a fan of Yamaha GP series as they're very comfortable but are also suitable for me as I have a nickel allergy.