Was it because:

  • shadow clones can't perform Susanoo, but wood clones can?

  • wood clones are stronger/better than shadow clones?

  • Madara couldn't perform Shadow Clone Technique?

  • of any other reason not mentioned above?

  • I think the answer is Madara wanted to test out some jutsu mainly hashiram's it's the only reason he used them because 1. Shadow clones perform any jutsu user know ex:- Naruto rasengan 2 . Madara might know about shadow clone because tobiram can perform it & we know Madara has a sharingan 3 . I think wood clone isn't different than a shadow clone but maybe small difference in endurance. – Ch.Siva Ram Kishore Nov 14 '18 at 2:32

In the wiki, it is mentioned that

Wood Clone Technique, unlike other clone techniques, do not disappear when hit and it is able to take damage to a certain degree. 'This, according to Madara Uchiha, makes it the perfect clone technique that only he with his dōjutsu was able to see through.' This happened in Chapter 577.

This was most likely the reason why he preferred using wood clones. The two other possibilities you mentioned above are not possible and here are the reasons:

  1. The first possibility is wrong since both Shadow Clones and Wood Clones can perform jutsu.

  2. The third possibility is wrong since Madara Uchiha is listed as one of the Shadow Clone users. He even used it to fake his death.

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