I guess film composer fans are not that much different than teenage pop star fans who file every critism of their heros as direct personal insult.
Yeah, those “versus” concerts are silly.
These concert are usually “and” concert advertised at least over here and just use (exploit) the general popularity of both film composers in one go.
Which would be akin to evaluating Bob Dylan by how he well he writes techno music.
Someone “writes” techno music? 😉 Seriously I get what you mean.