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Hi eichkei,
Your question is bound to generate plenty of debate. It depends upon your roasting philosophy. Most specialty coffee roasters roast on a drum roaster, but there are a decent number that roast on a fluid bed. The fluid bed produces a cleaner cup that many claim has a lower acidity. Some even claim fluid beds don't produce any carcinogens, but this claim has no substance behind it. The drum style of roasting can add more complexity to the flavour profile, but the operation can be more complex as well.
For the best drum roaster, if money was no object, I would recommend the Probat P25 fitted with a water quench and profile roasting controls with a VFD on the blower. These roasters are well built with a high resale value and this configuration will allow for dark roasting as well as a high degree of roast profile manipulation. It won't be able to handle the high airflows required for roasting in less than 6 min, but I wouldn't consider this to be specialty coffee. Also, Probat have been around for 150 years and aren't going to disappear in our lifetimes.
Cheers!