While I can't use the dreaded "strictly better" words because Midnight ReaperMidnight Reaper draws off itself dying and Grim HaruspexGrim Haruspex doesn't, the life loss can add up quickly when you're going wide or have an Aristocrats engine going, so most times if you had to pick between the two, you're going to choose Haruspex
If youre targeting specific cards for your deck or collection, singles are a great option for you
As well as exiling opponents cards before they can hit the grave, Dauthi Voidwalker is an unblockable source of damage that can steal opponents best plays and put them to work for you instead
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(It's an artifact with ", , Discard a card, Sacrifice this token: Draw a card.") Whenever you sacrifice an artifact, put a +1/+1 counter on this creature and you gain 1 life
Town Greeter fills a similar role in Golgari Roots and Golgari Graveyard, stocking the graveyard while generating card advantage