flanier I use the VMSVGA
which is the officially recommanded driver for linux guests since VirtualBox 6
VMSVGA: Use this graphics controller to emulate a VMware SVGA graphics device. This is the default graphics controller for Linux guests.
This is supposed ot offer better performances, but to be quite frank, the VBoxVGA
is better and it dynamically adapt the resolution when you resize the VBOX guest window which is a much important feature than supporting opengl 2.x