Dont agree with the nagware
I have had this phone since its release date and all i can say is once the initial setup was done, i have not had a single "nagware" notification as you call it. the UI is simplistic and very well thought out. Samsungs UI i find clunky at best and much slower. Having come from an iphone 7 plus to this (coming back to the android fold) was the best decision i have made in the last 4 years.
I did toy with the oneplus 6t but decided on this as i had a test drive of a colleagues handset and it was amazing!
Dont listen to what one "reviewer" thinks on this. What one person dislikes another might like. In my opinion this beats the S9+ hands down.