Well.....I 'm not an expert on either guitarist and only have a few Ozzy lps that Rhodes played on ...and I currently dont own any Van Halen lps not being a fan of their songs in general over the years... though Eddie was certainly a fantastic player. I also have no Quiet Riot lps....never was much of a fan of their songs and style either.
I did read a short article a few years back that said Eddie thought Randi had 'borrowed'(stolen?) his style and licks. Rhodes had said that he was till working on his 'own style' and naturally listened to other players for ideas. I think Van Halen was a bit ticked that Rhodes had some of his licks down and was maybe even jealous of the up and coming Rhodes.