Answer: Indeed, Abu Hurairah [radiyallaahu anhu] narrated more Hadeeth than Abu Bakr [radiyallaahu anhu], but that does not mean that Abu Hurairah [radiyallaahu anhu] heard more Hadeeth than Abu Bakr [radiyallaahu anhu], because Abu Bakr was a companion of Allaah’s Messenger [sallal laahu alayhi wasallam] in the summers, winters, nights, days, [during] journeys and whilst at home; so he heard [hadeeth or received more knowledge] than [others] and had more knowledge regarding the affairs of Allaah’s Messenger than [others]; however he did not spend a lot of time to sit and narrate to the people what was heard from the Prophet [sallal laahu alayhi wasallam].

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Source: Sharh Hilyati Taalibal Ilm’ page 49. abridged & slightly paraphrased