Seidel, M. JACoW Geneva, Switzerland High intensity proton driver accelerators are utilized for applications in particle physics, for the production of neutrons and muons, but also for accelerator driven subcritical systems. In particular superconducting linacs and large isochronous cyclotrons provide the potential to generate continuous Megawatt class beams. The talk discusses a number of aspects for both concepts, including parameter reach, reliability and trip rate, technical and operational challanges, economy.