The fettpride GMH is the accurate one, mostly because it was casted from an original ILM helmet (the Pre-Pro #2), while the bobamaker helmet is a fan made helmet, but specially made to achieve the ESB look (the physical damages, but the most important features are the argued helmet flare and the wavy brow). The only physical difference between the GMH (Pre-Pro #2) and ESB helmet is the overall size of the helmet and the physical damages applied by the original painters.