In efforts to increase efficiency and convenience and reduce administrative cost, some granting agencies have been exploring the use of alternate review formats, particularly virtual panels utilizing teleconference-based (Tcon) or Web based (Wb) technologies. However, few studies have compared these formats to standard face-to-face (FTF) reviews; those that have compared formats have observed subtle differences in scoring patterns and discussion time, as well as perceptions of a decrease in discussion quality in virtual panels. Here we present data from a survey of reviewers focused on their perceptions of the facilitation and effectiveness of panel discussion from their last peer review experience in virtual (Vcon/Tcon/Wb) or FTF panel settings. Reviewers indicated that, in terms of participation, clarifying differing opinions, informing unassigned reviewers and chair leadership, the facilitation of panel discussion was viewed similarly for FTF versus Vcon/Tcon reviewers. However, significant differences were found for many of these parameters between FTF and Wb reviews, which may suggest better panel communication (and thus more effective discussion) in FTF panels. Importantly, these differences disappear for respondents with high frequency of review participation (likely study section members), suggesting perhaps that long standing teams may be more resilient in virtual communication settings. Surprisingly, no significant differences were found between any of the reviewers' experiences in virtual or FTF settings in terms of the discussion affecting the outcome, in choosing the best science, or even whether the discussions were fair and balanced. However, significant differences were reported between Wb and FTF reviewers in terms of their perceptions of how well their expertise (as well as the expertise of their fellow reviewers) was utilized on the panel, which may suggest that the level of communication provided in FTF panels allows for better integration of expertise across panel members when evaluating research proposals as a team. Again, these differences across review setting disappeared for respondents that reviewed more often. Overall, despite clear preferences by reviewers for FTF panels, the lack of differences between FTF and Vcon/Tcon panel facilitation or discussion quality potentially supports the use of this review format by granting agencies, although subtle differences may exist that were not reported by reviewers in this survey. These results also provide some evidence of the perceived limitations in discussion quality in Wb panels, at least in non-recurring panels.