Why hoard Plus-X when FP4 is a better film? I think so, at least. Ektachrome is more understandable, because of course it's a more unique film.
I am glad you qualified your statement with "I think so" as my first choice would be Plus-X. However, did not stock up so, like many films that are gone, you use the next best thing. Ilford FP4 is a great film and a good choice.