Leggies always have more potential. So Yasir can turn into something special.
As of now, he is new.
As a package, I would go with Ashwin for sure.
India's most valuable test player.
He has like 4 Man of the series in 6 series in Asia.
Bangladesh test didn't have MOS. The others where he didn't win were England (where he got owned in 2012) and WI (SRT farewell) where him and Rohit were close contenders which Rohit won (fairly).
Among Indian test players, hje has equalled Kumble, Dravid, Kapil Dev and Bhajji in the amount of MOS he got and is just behind Sehwag and SRT. All while playing 1/5th - 1/10th of the tests they played.
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He is dwarfing all other Indian test players when it comes to impact in a series (not talking about overall quality).