Quick Sampler (Original) uses the original tuning, loudness, looping, and length of the content.
Quick Sampler (Optimized) analyzes the content and optimizes its tuning and loudness, searches for loop points, and cuts silence.
Dragging content to one of the available Alchemy zones inserts an Alchemy instrument plug-in using the type of synthesis you choose: Additive, Granular, or Spectral.
See PDF
Logic Pro Instruments: PDF