In general we credit whoever is credited as the main artist. It’s definitely ok to credit DJ-mixers and even compilers (or recording engineers / collectors, for field recordings!) if they’re given a prominent credit. But in this case, looking at the cover, the credit doesn’t seem particularly prominent - it’s in tiny letters and it doesn’t seem to imply this is much of a “Bruno” release. So I’d think it fine to go for Various Artists in this specific case, even as someone who generally dislikes using VA - I think this is a “both options are correct” kind of edge case really.