I'm quite sure this has been argued about for decades....but here goes!
I was watching an epidsode of Sky At Night (an English show - by the way, if anyone knows how to get episodes of this on DVD I'd be really keen to have some!) and Sir Patrick Moore stated his opinion that to view planets and the moon was better with a refractor than a reflector? In fact, he said that a 3" refractor was equivalent to a 6" reflector in planet viewing and that the image was crisper in a refractor. When I bought my 8" Dob I was considering a Celestron Nexstar at the same time: one of the staff at the store said that the 8" Dob was better than a 150mm Nexstar by "a country mile"....anyway, is it generally true that a refractor is better for planet viewing than a Dob? I mean, the views through my 8" of the moon last week were nothing short of AMAZING! Thanks all....
