Image Stabiliser or Fast Aperture, which would you pick, and under what circumstances??
You want a shallow DOF = fast aperture (portrait)
Hand held, low light, you want faster shutter speeds, don't want to push ISO any higher = fast aperture (sport)
Big glass to look cool = fast aperture (poser)
Hand held, low light, you want broader DOF, don't want to push ISO any higher = Image Stabiliser (general)
Hand held, you want slower shutter speeds that blur movement but no camera shake = Image Stabiliser (sport, lazy landscape photographer)