Ah, they're finally doing Madara versus Aizen? They somehow didn't do this years ago? Okay.

Madara should have this in the bag.

Remember when Aizen cast his most poweful destructive spell, the Black Coffin, against Ichigo, in their ultimate fight? What did he brag about? He bragged about his Kido being strong enough to warp gravity.

You know what also gives explicit ability to control gravity? The Rinnegan does. We have direct apples-to-apples comparison in raw power here, and Madara wins by virtue of casually throwing meteors around. Rinnegan also gives abilities to see into the spirit world and steal souls, so Madara ought to have zero problems sensing and interacting with Aizen.

There is exactly one feat, from the very end of Bleach, which you could raise in Aizen's favor: Aizen was capable of using his Absolute Hypnosis on Yhwach. By Aizen's own statements, this should only have been possible, if his own spiritual power is within spitting distance of Yhwach. But, and this is a really important but: the only source we have for things working this way is Aizen himself, and Aizen has been shown to be wrong about things, so. Given literally everything else about that fight, Aizen's not in the same weight class as Yhwach.

Aizen does explicitly grow stronger during his captivity between arcs, but by how much, is pure guesswork. He does not, for example, fight Ichigo again, so we can't even tell in any measured way if he's weaker or stronger than Ichigo by end of the series. "Now hold on", you say, "didn't Ichigo kill Yhwach?" No. Ichigo along with Aizen, Ishida and Renji killed Yhwach, with prior support from Tsukishima and Orihime. The argument for Ichigo being as strong as or stronger than Yhwach is the same as for Aizen being within spitting distance of Yhwach: based on dubious in-character statements that Ichigo must've been that strong to make the killing blow, he's that strong.