The camera on the iPhone is quite good. The latest model is equipped with multiple lenses, which not only automatically adjusts the brightness and focus, but also introduces a function that enhances the sense of detail through machine learning / AI. Because SNS that uses photos like Instagram is popular, many people take too many photos. At that point, you will be worried about the capacity of the internal storage.
Apple offers a service called "My Photo Stream" for iPhone users that stores photos in the cloud. Anyone with an Apple ID can use it for free and there is no limit on the capacity, but it can store up to 1,000 photos / 30 days, after which it will be automatically deleted, so it is not suitable for long-term storage .
"ICloud Photos" saves your photos to iCloud storage. It can be used free of charge as long as it is within the capacity (5 GB) provided free of charge for each Apple ID, and it is stored at the same resolution as it was shot, so it is suitable for long-term storage. However, the space is shared with other apps / services such as email, so storing hundreds of photos will run out of space. For long-term storage without worrying about the number of cards, the use of paid plans (50 Giga = 130 yen / month, 200 Giga = 400 yen / month, 2,000 Giga = 1300 yen / month) is practically essential.
You can also use cloud services provided by companies other than Apple. Above all, "Amazon Photos" is suitable for handling a large number of photos because the capacity / number is unlimited and photos can be automatically uploaded from a dedicated application. Live Photos and burst photos cannot be saved, but the resolution will not be automatically reduced. If the service content remains the same in the future, it is suitable for long-term storage. If you are an Amazon Prime member (500 yen / month, 4,900 yen / year), you can use it for free, and you can invite up to 5 people other than yourself, so the cost performance is considerable.
You can't say which cloud service is best unless you consider the number of photos and the family structure,