VCA vs Groups

A VCA is an extra channel strip that has nothing more than a volume fader⁠—occasionally it may also have mute and solo buttons, but no inserts, sends or panning. By assigning all the individual drum channels to the same VCA (let’s call it “Drums”) we’ll be able to control the volume of all of those tracks together as a group.
Aside from controlling the volume, a group bus has three giant benefits: inserts, sends, and panning. Unlike a VCA, which can only affect volume, a group acts like a regular audio channel.