They're both good in general.

Kurama is more for PvP in my opinions.

When it comes to PvP Madara is like another support to Konoha.

He still provides what's good for the team.

Group.

Kurama is still doing well, but meanwhile Madara smacks entire field with 9 units.

Madara can be used in many scenario for group fights such as Bond and GNW.

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About suppress armor. The cheapest ninja can do that is Tsunade SE as you quoted SB Ay and Edo Yagura. SB Ay is very expensive, just saying. You have to actually vs someone very heavy spender.

Tsunade SE is very situational ninja, rarely use to suppress Armor and she won't be pos 1 to stop him.

What I commented it sounds very bias to Madara. TBH I love both. I'd be happy whatever I get. I have teams in my mind.