The DTG machine I have is the larger one then the vid. It cost me 15k used.
There is no best possible way in the garment printing business.
You can start out with home printed transfers, pastisol(screen print ink) transfers, screen printing or heat press vinyl.
It all depend on what you are making, mainly the designs and look.
The home transfers will fade more, the screen print both transfers and direct screen print will have a "hand"(you can fell the printed design) to them.
The direct to garment printer is new that, it prints into the shirt,wood,tiles and more. There is no hand on garments because the ink is heat fused into it.
The problem with the garment printer is that the ink is not cheap and the black or dark shirt process has to be done on point or the design will fade or crack just like screen print.
The black or dark shirt process is the worst because you have to put pre-treatment on the shirt for the white ink.
You have to be good at that process, after that just put the shirt on the printer and let it print.
White or light colored shirts, you can just print or you can use a pre-treatment to make the colors pop more.
I did 13 shirts white both back and front for 10 each for a customer while looking at the NBA playoffs at home. The shirts cost me 1.18 and the printer rip calulates the ink cost at print time which was .16 cents. My total cost to make the shirt was with my time, I will go as high as 2.00. I still made 8 dollars per shirt which was 104 dollars to make 13 shirts in about an hour going slow. I could charge more for back and front but this was a new customer having a grand opening.
By the way I started with home transfers then I ordered screen printed transfers. I still outsource my large t-shirt orders to my screen printer to save on time. I use heat press vinyl too for sometimes. Just depends on the design and the customer too, if they are being cheap. They get cheap(home transfer

)