I'd honestly say Demi. Naming a sophomore album Here We Go Again is pretty witty, and a debut being called Don't Forget was smart as well (especially for promoting the release date). Unbroken capitalized on her rehab stint, and her self-titled makes it sound like the bridge between all the sides of her we've seen. These were all smart album titles from a marketing standpoint imo
I think that all of Britney's album titles are unusual and clever, except for the self titled duo ofcourse. I mean Oops I did it again... Who else would name their album or even a song that. Also Blackout, Circus both fit perfectly into what was going on in her life and Femme Fatalle is just a downright good album title <3
Natalia Kills' album titles are really good imo.
Hurts is very good at it as well.
Oh and Paloma Faith as well !
I mean, 'Do You Want The Truth Or Something Beautiful?' is amazing and very smart.
Same thing for 'Fall To Grace' and 'A Perfect Contradiction' is perfect for her sound this era.