Hashirama beat Madara more than just once. When they were kids Hashirama was stronger and when they were adults Hashirama was stronger. Madara already called Hashirama the ultimate shinobi, he was seen as the strongest in his era, he was called the God of Shinobi for his era, Madara wasn't. Kabuto said Hashirama is stronger than Madara. Hashirama is just stronger than him. not debatable.
Perfect Susanoo is still Susanoo.
PS Kyuubi had the same Mountain busting sword slashes, same nose, same armor, same diamond on the forehead, you are going to need real evidence if you wanna say they are different.
kabuto never said hashirama is stronger, he said ''was'', which is past tense.
here to clear things up why edo madara is stronger than hashirama:
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madara's prime is EMS + kyuubi + susanoo, edo madara is beyond = stronger than that. nuff said
PS isn't susanoo, its Superior in size, look and power, very different from susanoo.