You posted a manga, i posted a db entry which said they were equal. Secondly if one was superior than the other, they wouldve gotten the better of the uchiha but that clearly wasnt the case. Neither clan could finish of the other. Secondly that was in the past, currently you cannot deny which clan is the strongest and you are wrong. The strongest LIVING uchiha is obito. Ems madara's powers which considered him a rival to hashirama is below kamui, 6 bijuu, gedo mazo and rinnegan.
Id tell you why i believe the senju were more reliant on hashirama than the uchiha were of madara. The manga has made hashirama stand out from the senju so much that all the abilities that by hype the younger brother has is what hashirama has. From medic ninjutsu, to mokuton to ability to suppress bijuu all these abilities are hashirama and his alone. Secondly is the hint i got when it was made clear that its tobirama who created edo tensei. Its most likely because he wanted to revive is brother because he is the one who stands out, then there fact that there are no senju anymore apart from tsunade when the series was made
As for the uchiha they discarded madara, during hashirama's reign and when the manga started they were still going strong. Further given backing by this image;
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"The uchiha clan hasnt decreased". Cannot say the same about the senju. Atleast before the massacre xd