To evaluate peer review of author‐suggested reviewers (Ra), this research compared them with editor‐selected reviewers (Re) using 1‐year data collected from Journal of Systematics and Evolution. The results indicated that (1) Ra responded more positively than Re, that is, accepted invitations to review more often, more likely to suggest alternative reviewers, and less likely to neglect a review invitation; (2) there was no statistically significant difference in timeliness between Ra and Re; (3) editors rated Re reviews of higher quality than Ra reviews, but the word count length of these reviews did not differ statistically; (4) Ra made more favourable publication recommendations than Re; and (5) Ra were more often based in the country of the authors than Re, and this correlated with the location effect on reviewer response and publication recommendations. These results suggest that authors should be encouraged to suggest reviewers. However, in terms of policy or procedure based on the results of this study, journals/editors should collect and consult at least one review from other sources than author suggested, and when reviewers nominated by authors are considered, priority should be given to those with different locations from the authors.