It is evident that Chopin's final decision concerning the tempo of the Prelude was Vivace. The change was almost certainly related to a distinct change of concept of the piece, which was also reflected in other performance markings, which often differ between FCI and the other sources. Moreover, the markings of FCI are more detailed in a number of places, cf., e.g. the 
hairpins under the L.H. semiquavers in b. 1, dim. in b. 6, accents in b. 7 and 9.
See also the notes on the changes to the R.H. rhythm.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
notation: Verbal indications