Humans have a basic need to be constantly engaged in learning. The learning process, however, has undergone interesting changes as a result of the technological revolution, such as the advent of online learning. Technological changes in learning have also affected professional development courses. The purpose of this study is to compare attitudes among teachers enrolled in online and traditional training course in "Pisgah" teaching staff development centers in Israel. This study was conducted using a quantitative method. The study population included 495 teachers. The findings indicated four factors related to teachers' attitudes: Effectiveness and Application, Environment, Course Assignments, and Attitudes towards ICT (information and communication technology). Significant differences were found in the Environment factor and the Attitudes towards ICT factor between online and traditional training, in favor of online training. A multi-regression analysis found that the effectiveness of a course can be explained by the Environment, Course Assignments, and Attitudes towards ICT factors.