i don't have time to look for the scans since its quite late for ill try sum up everything i think and believe in this post.
Go back and watch/read the manga from when hiruzen is casting the RDS orochimaru is a jutsu freak so he would have wanted to see a jutsu that he has never seen before and you would be crazy to think that he will let hiruzen use it on him(while he has 2 robots to take the damage if its a dangerous jutsu) if you notice he says something like show it to me and then the edos attack with taijutsu thats enough to say that he really wanted to see what it could do and was pushing hiruzen around to make him use it and of course he didnt expect that the jutsu would seal his edos thats why he panicked and ended up getting serious at the last minute.
The fight
To be honest that fight was just orochimaru having fun and everyone should know by now that orochimaru was never serious until the end were he knew that RDS was dangerous and thats when he had the intent to kill, all the way through that fight orochimaru was so laidback and was teasing and pushing around an old tired hiruzen (orochimaru has that type of personality) while not having any intent of killing him he summoned hiruzen's teachers to try emotionally cripple him since hokages and ect are so big on family,friends and stuff it would be hard for hiruzen to fight against his previous teachers...So whats my point? orochimaru could have killed hiruzen anytime he wanted but thats not what he was going for he was just tormenting him and playing around with him.
Hiruzen beat the controlled hashirama and tobirama while they were heavily restricted and kabuto says the tags orochimaru were using assume full control of his edos and dont forget orochimaru studied alot about hashirama why wouldnt he know some of his moves, he might not have known them all but he knew abit of them.
also orochimaru half succeeded in making hiruzen give up and lose hope and be all weak until enma helped snap him back to his senses.
BOD you know what it does and orochimaru knew also what it does why would he let them use taijutsu at that points? Earth,water,forest release and you choose to fight next to your opponent ? how does that make any sense what so ever? if he had told them to move back and kill him with long or medium range attacks hiruzen would have been a goner and had no idea where the attacks would come from but that wasnt the case it was orochimaru's big headedness and curiosity that ended up getting tobirama and hashirama sealed and thats when he got serious and tried killing hiruzen knowing that he made a mistake of letting him live that long.
also my last 2 statements you can ignore as they differ depending to who they apply to.
but ill just tell you this hashirama beats hiruzen in hype and in feats
Hiruzen:
sealed controlled hashirama and tobirama
fought Orochimaru with two edos (an impressive feat)
longest reigning hokage
god of shinobi
strongest kage of his time
knows over 1thousand jutsu
pushed kurama out of the village
strongest hokage - (which i believe is biased to the time hiruzen lived- ill explain hashirama's strength was said to be a fairytale in other words strength that when heard about its not believable and many people from the time hiruzen was on his prime wouldnt have known about hashirama's strength only the things they hear from stories,rumors,news or wherever they heard it from but many people who were alive and old at the time naruto and his generation would probably still know of hiruzen's strength. if we took a person sage of six paths and them another person obito (think of it as he has the full juubi) and obito destroys and kills alot of people and he is defeated by naruto (main character) then people who were at the war and survived would know what the power of the sage is capable of and would find it easier to believe wouldnt they? after many many years when people hear the stories of obito they would probably pass it as a fairytale (assuming there isnt someone as strong as obito at that time already - lets say how naruto was before the war) they would find the stories hard to believe and probably pass it thats the same case i think would apply here why? because not many people witnessed hashirama's strength so that title is biased) <- can ignore it if you would like
thats all i can think about from him to be honest
Hashirama

he has alot of hype that hiruzen has)
Beat madara and kurama
had several tailed beasts at his control
god of shinobi
knows over 1k jutsu ( he was leader of the senju at some point and the senju are known as the clan of a thousand jutsu ect so its not that hard to believe he knew alot of them and he is the one who had the scroll naruto stole in the beginning - its safe to assume that the scrolls in the hokage office are filled with jutsu passed down by previous hokages(and other people)
strongest shinobi at his time)
Strength that is like a fairytale ( and madara believed 5kages combined weren't as strong as hashirama)
to be honest that should be enough to top hiruzens
a few more things hiruzen also has little to no feats and a little hype which he yet hasnt really proved so thats why i am leaning towards hashirama being stronger and a better hokage (for various reasons) ILL CHANGE MY VIEW WHEN HIRUZEN /KISHI shows me this prime of his
btw we also havent really seen how strong hashirama's prime was aswell we've only seen some of what he could do there could be alot more lets wait for the manga to show us both hiruzen and hashirama then we can finally say - dont get me wrong i love hiruzen but putting him as the strongest hokage or shinobi currently is really not a good idea since he has no feats to back any of it up we can never know until something is shown to prove it and hashirama has proved his monsterlike strength a few times ( i also believe his current edo is not as strong as he was alive(prime)?)