There is no question of Deepika being a "far better" actress than Aishwarya. If you compare their SLB movies side by side for an honest appraisal, and end the comparison there, Aishwarya is head and shoulders above Deepika in every single way.
Speaking of Deepika, she is many things but an extraordinary actor? No, she is not. She is a good model cuz she is tall, has a good body language, can dance, looks pretty and therefore can keep your eyes glued to her when she is on the screen but acting is not her strength. She has her moments in a few movies but her dialog delivery sucks and there's a lot left to be desired.
There are some movies where she shines but I still can't bring myself to credit her acting skills in them. Almost all her performances (excluding dance numbers) fall within the range of below average to average. At her best, she pushes the higher end of average.
With that said, there is no other reason to compare Ash and Deepika apart from the SLB connection. They're neither contemporaries and nor are they competing for anything. Female centric movies are niche and have a long way to go before they can be pitted against each other for their individual BO pulls. The day female actors start giving out blockbusters with their sole star power, we can talk.
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