As a DAT (Dumb Ass Tanker) MOS 19E on M-60A1s and having played with the others as well the correct answer is all or none of the above. The M-48 Gasser (Gasoline) was a lot faster, the FCS in the M-60A3 was better than the others by an order of magnitude or two, the ERA on the Marine M-60A1 made it the best armored, the Diesel AVDS-1790 got the best fuel MPG. Given my druthers I would rather have a Marine M-60A1 W/ERA and add the TTS (Tank Thermal Sight) + the LRF from the Army's 'A3 as the best "tank" of the series "CDAT" was first aimed at the M-60A2 and later the M-1 crews. (Computerized DAT) Speaking of the M-60A2, the 152mm gun/launcher would have been a nice to have addition, missile for long range anti-tank work and the 152mm canister for close up anti-personnel work. Today the M-60A2 is still in the motor pool as a AVLB. The M-728 CEV (Combat Engineer Vehicle) with a bulldozer blade, crane and 165mm demolition gun would also come in handy in urban areas. The CEV with ERA would make a hell of a nice Urban Combat Vehicle.