Heat pump dryers are the cheapest to use but are more expensive than the other two types. In time this will be the only choice you will have.
Vented are the cheapest to buy but use more electricity, something like the Indesit IDV75 basic dryer is a good little workhorse and easy to repair. Condenser dryers are the middle road in price, don’t need venting and you can have sensor models which will monitor the dryness level and turn the heater off when dryness level is achieved therefore saving money.
All in all condenser dryer with sensors is the way to go.
Don