Well, when we stretch, we stretch with more force than an [words=http://www.
phallosan.com/shop/catalog/default.php?z=eNortjIxtVKyL0pNszWxMFcrSSxKTy2JL0hMT7U1UisoykyxtbBQSy4tLsnPjS8uKcrMS7dVsgZcMMpbEbo%2C]All Day Stretcher[/words] such as the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]Size Genetics[/words], which holds your penis stretched for long periods of time.
All Day Stretchers keep your penis stretched while the cells duplicate. All Day Stretchers work on increasing the cells and stretching the Tunica.
Manual stretching does help the cells duplicate but it works on more than just the tissue and the Tunica. Stretching your penis manually also works the ligaments and helps pull out the inner penis among other bits.
They do slightly different things, if that's what you meant? It was slightly unclear.