Better how? Having just driven an XC40, V60 and a few G20s back to back to back, I can tell you the build quality and quality of materials are higher in the BMWs. Don’t get me wrong, the Volvos are nice, but not up to BMW levels.
Build quality and material quality isn't the be all and end all though (unless you are just trying to impress the neighbours) - I actually prefer some vehicles which are much more mid-tier because the interior is well thought out and complementary in design - especially Mercedes I find the interiors look like they are trying too hard and that undoes the premium quality for me. For instance I kind of like Nissan's Tekna line while a bit plasticy it tends to be clean and effectively implemented rather than a hodgepodge of fancy styling and similar for the Volvos in many cases - nice clean styling while using decent materials - though I've seen some Volvos which look like they tried too hard as well.