Which of the following codes would perform faster in terms of simulation time? this code will be part of a uvm driver.

1.

@(vif.monitor_cb iff (vif.monitor_cb.pack && vif.monitor_cb.val));

or 2:

            @(vif.mst_mon_cb);  
            if (vif.mst_mon_cb.rsp_pack == 1'b1 & vif.mst_mon_cb.rsp_val == 1'b1)

gemini tells me that the first one performs better, but I don't trust it