And you base this opinion only in your prejudice against Fl Studio or you have any actual experience/argument you care to share with us?.
Fruity sample imports Acid loop info, Slices, Rex 1 & 2 files, Uses lopps points. Etc.
In any case case im not comparing Kontakt to a Fl plugin , but Kontack vs all the integrated FL Studio Sampler Features. I KNOW that Kontak have some featrures that FL Studio lacks (IE Akai sample support, loop point editing) But i wonder if you really need it in your current setup.