The range and choice of mouthpieces is enormous, and can therefore be confusing. We will address some special model series here in order to give you an idea of the variety available.
Everyone can imagine what a Standard Series is.
These are mouthpieces particularly favoured by learners or hobby musicians.
Relatively easy embourchure, and a good sound!
There is a number of companies which offer truly heavyweight mouthpieces. Called GigaTone, Heavyweight or MegaTone, they are offered in addition to the series models and don't only seem twice as heavy in mass but are even heavier.
The sound you experience will be darker, more voluminous than with the standard models.
Some companies differentiate between standard and custom models. Among the custom series you will find mouthpieces which are fashioned with a wider opening and which generate clearer and darker sounds than the standard series. However, as the "custom" designation indicates, they also require more effort.
The embouchure is more difficult, but the result is usually more attractive.