This paper compares outcomes of student teachers' use of oral classroom and written online forum discussions of course literature, with the aim of examining how each mode facilitates reflective practice. Data were collected from a class of 11 participating student teachers. Oral discussions were video-recorded and written online discussions were saved as Word files. Clinchy's levels of knowing were used to determine the depth of the reflections and qualitative analyses inspired by Harasim were carried out as a complement. Findings indicate that on a group level the performance according to the levels of reflective thinking was the same. Both modes have advantages and drawbacks, but it is clear that there should be a variety of modes to provide individual student teachers with better possibilities of developing their reflections. Further explorations of the interaction between modal preference and modal performance, as well as the implications for online peer collaboration, are discussed.