One aspect that hasn't been considerd:
Facist regiems seem more prone to attacking countries they can't beat, and ending up being overthrown as a result (either by the victor, or by their own citizens).
That in turn may mean that the chance each day you'll get killed is higher (either by being conscripted into the attacking army, or getting hit by the retaliation), but the regiem won't last as long, and if you don't die you might out live it.
Whereas Communist regiems seem to last a lot longer (e.g 1917-1990s for USSR, vs 33-45 for the Nazis), so even if they don't kill you (and they''ll have longer to do it in), you might well never live to see freedom.
Overall, though, I think it depends more on the particular regiem or its dictator, than its political ideology. Some are just more vicious than others. I think it would be better under Mussolini than Stalin, but better under Castro than Hitler. And Pol Pot was probably the worst of all for the average individual.