It's almost a tie. The two best welterweights in the world fighting each other vs the two best lightweights in the world fighting each other. All 4 of them are on almost all top 10 best PFP lists with Loma and Crawford often being rated 1st or 2nd best PFP. I think Spence beats Crawford and Loma beats Mikey. I'd give the edge to Spence knocking out Crawford as a better win than Loma knocking out Mikey. MAN DOWN!
Mikey if he beats Lomachenko. The hype surrounding Lomachenko is astronomical(much of it deserved) and will be a massive win for him if he pulls it off. Spence and Crawford, while oozing with talent, are practically doorknobs outside of the USA....no one knows them.
If we go by p4p ranking it would be Spence beating Crawford since Spence is the lowest ranked of the 4 p4p and Craford is the highest ranked p4p.
IMO they are both 50/50 fights so its even regardless of the winner.