Yes, Fincher is definitely better now, more interesting, more cerebral; but Aliens is top ten all time.Aliens... Out of all of his work, is a definite masterpiece.
A film that literally holds up today better than anything out there of the genre and better than many many other films in other similar genres.
The GOAT is Cameron and Aliens is his best.
Fincher's 11 movies have grossed $2,109,720,866 worldwide.
Cameron's 14 movies have grossed $6,234,727,355 worldwide.