The RESCRIPt plugin could be used to accomplish this comparison qualitatively. See the example (including an example visualization) using the evaluate-taxonomy action here:
The result will give you an interactive lineplot for comparing different metrics at different taxonomic levels. For example, you can look at the number of unique taxonomic labels found at genus or species level for each primer set (with one separate taxonomy file for each primer set).
If you have a mock community included in your dataset (i.e., a sample containing known species mixed at known proportions) you can also do a quantitative comparison using the q2-quality-control plugin to see which primer set achieves higher accuracy. See an example in this tutorial: