Which is the worst TM work?
hard to say, some might say FA, others might say FP fragment. Personally, after looking over the romance and horrible horrible writing of both, I conclude, that FA is slightly worse than FP fragment.
FP fragment, is the reboot of FP timeline, written by Sakurai, Nasu's right hand women. Having a female write a female protagonist seem like a good idea, but Sakurai have one serious problem.
Mainly her mary-sue tendencies and her terrible grammar skills, oh god.
I am not a man who is picky about grammar and writing skills, but when the audience is having trouble understanding what you are writing,
you need to consider looking over on what you are doing with your life. Sakurai loves putting internal monologues that completely break tempo and immersion, while describing things through internal monologue, which can get really grating.
Paired with how insufferable her Mary-sue tendencies get with Manaka and gross under use of certain characters, we have a recipe for a very terrible work.
However there are upsides to Sakurai in comparison to Higashide. One, Ozymandios and Arash are some of the most cool character she have designed and parts about them are actually good. Second, besides arthur's questionable white knight brain deadness and Manaka's Mary-sueness aside, there is actually few "special" thinking process in comparison to Higashide's FA, the plot is actually more solid than Higashide's FA, Manaka curbstomp the competition, horribly maims the contestants, arthur see she is evil, backstab next to grail, simple and effective.
Overall, while fragment is a pretty terrible work, there are a few spots of shine buried below the turd, dig at your own danger.