Honestly, I think, Deepika is beyond those kind of roles...Alia still has a way to go to play the mature roles Deepika has played...they are really different in charisma and screen presence yet both rather well casted for the characters they had to enact.
I would not have liked to see Deepika as a Gangubai (Bhansali in any way has shown a weird view on her potential as an actress).
If you go through the characters both have played, none of them, imo, would have suited those the other had played.
Actually, I find Alia being miscast in her two period movies Kalank and Gangubai and completely wasted in Brahmastra, but well cast in her other movies...and excellent in the one she produced with RCE.
And Deepika with her expressive body language should not be in a movie like the one the Jhumka song belongs to...

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