Mobile health apps make up an enormous market in mobile phone app stores. These apps allow automatic measurement of vital parameters and transmission of data to the doctor. Older users often reject mobile health apps for various reasons. We investigate the influence of several user factors on the willingness to use a health app integrated in a mobile phone vs. a stand-alone device. Furthermore we look into the modality for data transmission and its influence on the overall acceptance. In a questionnaire study (n=245) we ask both healthy and chronically ill (heart disease and diabetes) for their preferences. Using multiple linear regression analysis we found that the motives to use such a device influence the preference for an integrated device four times more strongly than the participants age. Still, the older the users are the more they prefer a stand-alone device.