I am one of those people that will not own a brush the nozzle has to be unscrewed from the body. Removable head assemblies are fine, and drop in self centering as well. (micron/gsi creos platinum and ps770, style heads can all be removed and cleaned without unthreading the nozzle)
Then all the H&S airbrushes, eclipse series, badger Patriot and things with large not easily lost self centering nozzles are easy to clean out.
Now with my experience, I can go a long time between cleaning but it still bugs me to have to unthread A nozzle if I need maintenance. Having only stripped one this way, it was enough.
I won't even recommend a brush that has a screw in nozzle only for a beginner.