i never seen a DQ only DA DB DC and i believe there is also a class H in the bubble and at least one neutron star. if you cant tell from the size/brightness/distance from the star when you jump in which it is generally neutron stars have fast rotation and the jets move very fast. with white dwarf the jet seems static or moves very slowly indeed.A tip for you, OP. Target the star while you're facing it to scan it. On the lower left of your HUD, once the scan completes, you'll find out what class of star it is. It will tell you it's a DA, DC or DQ class White Dwarf.
White Dwarfs are visually similar but also distinct to Neutron Stars. White Dwarfs have larger bright cores, smaller jets that barely move and much larger exclusion zones. Neutron Stars have tiny cores, longer, more defined jets and much more exaggerated movement which ranges in speed from slow spinning to ultra fast.
There are a lot of White Dwarfs in human inhabited space, but maybe only a couple of nearby Neutron Stars.