Printify's Print Provider partners are not all the same. They may use different printer technology and printing methods. They may print on different materials as well. Even if they print on the same garments and use the same printer technology, each print provider performs its own unique tests to achieve a desired color output.
In addition to having different garment options, print providers also have different print areas. This means that some print providers offer larger print areas as well as more print areas in general, including sleeve printing, product tag printing, and printing on both sides of the garment.
You are encouraged to perform your own research on the available print provider partners and to choose the provider that best suits your needs. More information is available at https://app.printify.com/print-providers as well as on the individual websites for each print provider.