Sheesooxe52
There’s basically no difference between the two.
The Day Pass for 78.- is the standard offering (for HFC holders) whenever the price of a regular point-to-point ticket exceeds those 78.-. In other words, you’ll never pay more than that in case of a very long journey. This day pass is also fully refundable until the day before travel, same as with point-to-point tickets.
The Saver Day Pass is the discounted alternative, which is getting more and more expensive the closer the travel date is approaching (it even might sell out in case of high demand). Downside: No refunds in case of a change of plans (excepted medical reasons with provided doctor’s certificate).