I am trying to decide on which procedure would be best for acne scarring: the Vampire Facial or Vampire Facelift? (photos)

We usually recommend the Vampire facial for treating acne scarring. Combining microneedling and topical PRP, the Vampire facial is best for addressing texture issues like oversized pores, rough textures, and wrinkles, to restore smooth skin (whereas the facelift focuses on restoring volume and shape). More extensive scarring and indentations may also benefit from a more tailored PRP treatment or a Vampire facial that’s combined with or followed by supporting treatments.

Absolutely, you want the Vampire Facial!! The Vampire Facial addresses tone and texture of the skin....including acne scarring.  The Vampire FaceLift procedure addresses the shape of the face.  The Vampire FaceLift can be used instead of injected volumizers of the face.  
Often, people want both improvement in the shape of their face (to reduce face hollows under the eyes, for instance) AND improvement in the facial skin texture and tone/ pigment irregularities and scars.  For those people, a Vampire FaceLift AND Vampire Facial, often done at the same session, is indicated.