Technological developments are constantly changing the framework conditions for electric operations. What seemed optimal ten years ago may now be outdated. With a systematic direct comparison, we assess whether an existing system is still the best solution or whether alternative technologies would be more economical and efficient in the long term. We analyse investment and operating costs, energy supply, charging cycles, vehicle availability and infrastructure effort. We compare classic trolleybus systems with battery trolleybuses, depot charging as well as opportunity and flash charging. A special focus is placed on operational impacts: How do rotations, ranges and staffing requirements change? What additional or reduced costs arise? The results provide a fact-based foundation to decide whether system renewal or a technology switch is the better long-term option.