Choosing a Trumpet
Choosing on the basis of the design

The bore of a wind instrument is the internal diameter of the tube through which the air passes when the player blows into the instrument. Since the size of the bore determines the volume of breath required, it will also affect the timbre.
In increasing size, bores are described as "medium bore," "medium-large bore," or "large bore." The smaller the bore, the less breath is required, resulting in an instrument that is easier to play and which boasts a subtle, mellow timbre. A larger bore requires more breath and produces a rich, flamboyant timbre and a higher volume.

The piston system and the rotary system are two of the valve systems on the trumpet. The advantages of the piston system are its bright timbre and the scarcity of any malfunction. However, the fact that the pistons must move up and down can be something of a disadvantage in up-tempo passages. The rotary system meanwhile is characterized by a deep timbre, with clear transitions between notes. It is also easy to operate. The disadvantage, however, is that the rotary trumpet is somewhat prone to malfunction.