Among the present and near future missions aimed at detecting and studying Gamma Ray Bursts, the Wide Field X-Ray Monitor (WXM, [1]) on board HETE-2 and SuperAGILE ([2]) on board AGILE have very similar characteristics. We applied the same simulation tools to these two experiments and compared their expected performances, with a particular focus on the expected event rates and the instruments’ localizing capabilities. Both experiments use the one-dimensional coded aperture technique to localize sources, and both have several detectors equipped with masks that encode the field of view in perpendicular directions. The two-dimensional position of a detected source can be determined by crossing the two one-dimensional positions.