Hi,
we have digital ones that can run all kinds of programs and that you can program in a fun way. We hardly use that; they are all set to one temperature 24/7.
Frankly, the advantage for us is the nicer look and they always nicely display the time....
In terms of pure function, it doesn't matter.
The extra cost was only about 20 euros per device (35 € instead of 15 €), which was worth it for us.
They are devices from Salus, which are quite inexpensive.
Best regards,
Andreas