Please check with other answerers before you decide. We bought a silk screen machine and i still have designs from 30 years ago. The ink has not faded. It worked great and we sold a lot of t-shirts and tropical fashions.
But a modern heat press may be much more advanced and i just don't know./
Silk screening is more durable and will last longer. With the aid of a computer there is no difference in what you can do to edit, etc... a picture for printing (the main feature of digital)