Just been researching same subject as our vented one was getting long in the tooth (failing to turn on occasion and bearing noisy)
From what I could gather, heat pump ones are basically more efficient but take longer to dry stuff.
Regarding ROI on that higher price vs lower consumption… somewhere in the range 5 to 10 years appeared to be the general view but I didn’t go into the numbers in detail.
CBA emptying the tank on a condensing one.
Also read some reports that any type with moisture sensors can be either problematic or shut off too soon before stuff is dry.
In the end, just bought another basic timed vented drier (£170) with biggest drum and load capacity (8kg) that I could find.
Run it for 10 years and then throw it away when it goes wrong.