You'd be assuming that Madara couldn't do that. They're both Indra incarnates that can handle sage chakra with ease. The difference is that Madara has the body of Ashura as well, so he potentially has better chakra control.Huh? He attacked his daughter in order to land any hits on Sasuke.
Sasuke already surpassed Madara in skill. During the final battle the Kyuubi said Sasuke's chakra control is on the Sage's level, now he's developed his Rinnegan far enough to teleport to Kaguya's dimensions which only Kaguya was shown to be able to do.
On top of that he can use multiple elements with his Susano'o - Enton,and Lightning,and he can use Preta Path while having Susano'o activated whereas Madara never used any elements with his Susano,and specifically said he couldn't use Preta Path while having Susano'o activated.
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Madara hasn't shown any of his Mangekyou Sharingan techniques besides Susano'o, but obviously he'd be able to incorporate them into the former. We haven't even seen Sasuke use lightning with his Susano'o (at least as far as I can remember).
The two scenarios are different. Madara was unable to absorb chakra while constantly putting out chakra as well to create Susano'o. Sasuke on the other hand was not absorbing any chakra; only encaging it. It's not a difference in skill.