G4A nicest from power point of view and no turbocharger to go phut. We had G2's & then G4A's. Hydraulic collective on G3's and up (except G5's) definitely nicer but oddly, the G2's seemed easier to do nice EOL's, notwithstanding the lower inertia blades. G2's ASI more truthful in autorotation compared to wide bubble types which over-read- ask me how I know!
I have recently flown a wooden bladed manual collective G model which had a nicely balanced collective, so it can be done but not on those with metal blades.