One of the promising areas in human computer interaction is the brain computer interfaces and EEG headsets are widely used technology in this domain. In this study, performance comparison of two different low-cost EEG headsets, NeuroSky MindWave and Emotiv EPOC EEG, in tasks requiring attention and relaxation, and their user experience and usability evaluations were conducted. There were 12 participants who were asked to perform attention tasks that require high cognitive load and relaxation tasks. While the Affect Grid scale and AttrakDiff questionnaire were used to evaluate the user experience, the NASA Task Load Index and System Usability Scale were used to reveal the usability problems of the devices. When the statistical results were examined, it was observed that the NeuroSky MindWave was more successful than the Emotiv EPOC in relaxation tasks. However, both have similar results in tasks requiring attention. According to the user experience evaluation results, it was observed that the participants felt tired while using both EEG heads, but were still satisfied with the use of the devices. They reported more positive opinions for NeuroSky MindWave in terms of usability.