I mean the combo College of Lore Bard (11) / Knowledge Domain Cleric (1) has technically already been mentioned, though without specifying the class specializations.
You gain two more Expertises, though limited to knowledge skills. You get three really useful Cantrips for a Bard - Sacred Flame as a better attack spell, Guidance as a support spell (but you get it from an item and its a concentration spell), and as the really tempting option Thaumaturgy for conversations. You also gain proficiency in Shields and Medium Armor and more weapons than before, and of course Cleric spells, which you however cast using the Wisdom score.
Personally I prefer the pure Bard though. These benefits are all in the "why thats nice, but not necessary" category. Getting Bard spells and the other Bard extras faster is more worthwhile to me. The earliest you really can consider getting the Cleric level is at levelup #6, and then many chances for using these Cleric extras are already over.
