Mostly personal preference. iOS just feels so much faster and optimized to me. Also the hardware looks more attractive and feels better in the hand.

Only used Chrome for years; switched to Safari on my iOS devices about a year ago as it’s very smooth and super optimized for iOS. Also like how it will create a random strong password for you and save it if you’re making a new account on any site. Still have chrome installed as a backup and I always use chrome on my computers too.