The only real difference in many dryers, aside from superior or inferior airflow, is the wattage of the heating coils on their electric dryers or the BTU output of their gas dryers. That may cause drying times to vary somewhat. Lesser dryers will get away with smaller coils, maybe causing longer drying times. I think the Performa dryers (and plese folks, correct me if I'm wrong) use a 5000 watt heater, while the GE dryers still use a 5600 watt coil set. Gas may be a difference of 2500 BTUs or so. Not really that big a deal. Of course, without good airflow, the heat output doesn't make a great deal of difference, so the blower is the more important of the components.
After that, the quality of the bearings, drum supports, etc., will dictate the useful life of the dryer before major service is needed. Nothing like hearing the thud thud thud of a drum running on a broken drum support!!!