The seven delegate apportionment methods used in the presidential primaries are analyzed and compared, according to whether they satisfy basic properties such as homogeneity and proportionality. We consider how often the delegate apportionment methods satisfy the quota condition and quantify their degree of bias for and against the strongest and weakest candidates by analyzing delegate bias, delegate thresholds, and the behavior of the methods in close elections. These ideas are then related to the sensitivity of the apportionment methods to small changes of the vote totals. We also determine which methods satisfy majority and leader criteria, and discuss the methods’ propensity to support candidate coalitions. We conclude by comparing overall vote share to seat share for the strongest candidates in recent state primaries.