Wouldn't it be a matter of personal preference and experience and mostly availability? I started smoking Dominican cigars but after a couple of years, smoking two or three coronas and/or churchills a day I turned to Cubans, and if not available Nicaraguans. Now when I am back in Belgium I order Cubans on-line (
www.CigarsOfHabanos.com) and take a 100 or 150 with me to my place in the DR.
My experience among friends is that the experienced smoker prefers Cubans to Dominicans.
I don't know where those who posted here are from but I can imagine tha few Americans really know Cuban cigars, would that be a reason they prefer Dominicans?