Over the years, I have transitioned from an Olds Ambassador to an Olds Recording, to an Olds Super Recording. So I know how the slotting becomes keen and the blow more open as you progress. But you will one day learn that when your technique is solid, your control is spot on, and you have proper use of breathing dynamics, it really doesn't matter which horn, starter or pro, you have in your hand. You will get an excellent response whenever you play, because when it comes right down to it... it is your physiology that rules and controls the horn. AND you will sound the horn like you want it to sound, again by biofeedback of the horn on your lips, and you instantaneously adjusting to compensate.
There are skilled drivers that can make a Toyota Camry out perform any novice BMW driver. Same is true of the beginner versus pro trumpet... what ever that is.