Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: smart watch iphone compatible
Product list:
A: 321OU Smart Watch Compatible iOS Android iPhone Samsung for Men Women, Make/Answer Calls, Checking Messages Support, Bluetooth Watch Fitness Tracker with Pedometer Camera SIM SD Card Slot (Off-White)
B: Willful Smart Watch for Android Phones and iOS Phones Compatible iPhone Samsung, IP68 Swimming Waterproof Smartwatch Fitness Tracker Fitness Watch Heart Rate Monitor Smart Watches for Men Women Black
Answer: B,A