Draco only disliked Slughorn's favoritism because it didn't include him, really. He'd have been perfectly happy to go on being the favored student in Potions with Snape, but being constantly reminded of being shunned by that ridiculous little Slug Club was obnoxious. Still, as classes went, Potions was something Draco enjoyed.
He thought for a moment and then asked, "Calming Draught? I think you're right, it would be easier." Snape had shown him to crush them instead when he was studying the potion in fifth year.