Roasting coffee greatly decides the taste that the coffee will acquire. Different methods of roasting coffee can give different tastes to it. A fluid bed roasted coffee in your cup holder would seem to taste a lot different from the one which is drum roasted.
In fluid bed roasting or moving air roasting, the coffee is first roasted in the roaster by convection in an oven. Here, the coffee is being subjected to hot air in a medium that may be liquid or gas. The major set up in this roaster is that the coffee is not being directly heated but is simply subjected to hot air in an indirect manner. Even in a drum roaster, the coffee is roasted by convection but the difference is that after convection the process of conduction is also undergone in drum roaster which helps the coffee to get a taste unlike the one simply put in a fluid bed roaster. The direct contact of heat in a drum roaster gives the coffee a taste which has another aspect added to it and is highlighted in other fashion. Using a typical gas or by means of electric appliances, the heating process is being carried out in a drum roaster.
While consuming coffee from your drink holder or other wheelchair accessories, one can feel the difference in the weight of coffee. The fluid roasted ones are comparatively lighter than the ones processed by drum roasting. The after taste of the coffee is sure to speak everything about how the coffee tastes in accordance to the way they would have been processed. Fluid air roasted coffee is hard, strong and more acidic. Moreover, it is brighter and lighter than the drum roasted one.
The taste of roasted coffee in a drum roaster will tend to hang back with you. Once you intake that is the flavor that will last for a long time after one cup of coffee. The taste is soft. The coffee seems to be heavier and weightier. The coffee by convection and conduction with direct heating reveals the beautiful side of coffee that will give a fuller mouth feel.
One great example of good coffee is Ethiopian Sidama. The after taste of this coffee gives and incredible flavor like that of cherries covered with chocolates.
Above all, roasting the coffee to a certain point of darkness or to a particular depth of roasting hardly affects the taste. The original change in taste comes in the way of roasting. One must choose the roasting process by the taste they desire to have.