For an architecture student, you need to buy a phone that'll support CAD apps. IPhones are obviously good but the option to have many CAD software will be limited as compare to any android phone (thanks to Play Store). Thus, I would suggest you to go with Galaxy Note 8. You would get wider options for designing related apps.
Hi, I found a really helpful infographic here, you can check this out this will really help you. I hope so.