I'm nowhere near expert enough to call it definitive -- but I've enjoyed Zhukov recordings of Scriabin's music very much.
I only have one other LP of Zhukov performing Scriabin (below), and I've been thinking about upgrading to Zhukov's complete set of Scriabin sonatas, which Melodiya has reissued on two CDs.
. . . the complete set of sonatas on CD:
FWIW, I also like Scriabin recordings by Sofronitzky, Horowitz, Melnikov, Ashkenazy, Berman . . . It would be difficult to pick just one interpreter.