FN has BWBB and GIB, two duds, TUN has make up, a dud

FN has better singles but TUN is better overall 

Thank You Next was massive, it was Ariana’s peak. But I prefer to listen to Future Nostalgia. It’s the better album for me.

FN is the right answer

TUN was naturally a cultural zeitgeist, something FN isn't. People naturally gravitated to Ariana during THAT era and she ruled the charts with an iron fist during that time period, thought Dua's FN is objectively bigger but it definitely took way more work and she had a lot of push (not that its a bad thing).

Duas

tuna is better but FN is bigger

Future Nostalgia is better and also bigger, though thank u, next had a bigger cultural impact and likely would have been bigger with the same level of artist/label dedication and investment that Future Nostalgia had.

thank u, next sounds very of its time and produced singles that did not have a lasting impact. future nostalgia on the other hand is timeless and its singles (while not charting as high in the US) had a bigger impact on the music industry 

 

(future nostalgia also has the smash that got away “cool” which is better than the entirety of thank u, next)

I like Ariana but FN wins this, hands down