Cider Yeast for Homebrewing

What is the difference between Fermentis SafCider AB-1 and AC-4 cider yeast?

Both are Fermentis dry cider yeasts that ferment from 10 to 30°C (50 to 86°F) and suit sweet and dry ciders made from fresh or concentrated apple juice. Fermentis describes AB-1 as giving a delicate aroma of fresh apple and applesauce with a balanced mouthfeel, and as excellent for low gravity ciders. It describes AC-4 as giving an intensely fresh apple and floral aroma with a crisp mouthfeel, ideal for fresh and crisp cider. Choose AB-1 for a rounder, balanced cider and AC-4 for a fresher, crisper one.