Power
Electrical power consumed by the device during operation. A more
powerful appliance spends less time cooking to readiness; at the same time, the high consumption of electricity is often offset by the speed of cooking (in other words, the device simply does not have time to "eat" a lot of energy). However, such a device will also cost more. Therefore, it makes sense to specifically look for such a technique mainly in cases where “every extra second matters” — for example, if a toaster is bought for a cafe or diner where you need to cook quickly and in large quantities.
Also note that a device with a large capacity will inevitably require a higher power.
Roasting degree
The number of roasting levels provided in the device.
This parameter is relevant primarily for models with step adjustment (see "Control"). Each degree of roasting corresponds to a certain fixed power setting in them. Accordingly, the more such steps, the more options the user has, the more accurately he can set the preparing mode. At the same time, we note that even for an advanced model, 8 – 9 steps are considered quite sufficient, a larger number is extremely rare. And for simple household use, more than 5 – 6 steps are rarely required — unless you plan to cook according to specific recipes.
Note that the number of degrees of roasting can also be indicated for equipment with smooth adjustment. However, these are not fixed settings, but only auxiliary divisions on the adjustment scale; they are applied in order to make it easier to navigate for the user. So you can not pay much attention to this moment when choosing a device with smooth adjustment.