vavo voltage

Hi, can someone help me? I'm trying to understand the difference between two Cadence tools. The first one is called "Voltage Storm Analog Option (VAVO)", the other is called "Netlist based Electromigration and IR drop Analysis (EMIR)".
Both seem to do dynamic power grid analysis which is the thing I'm interested... I'm familiar with Voltage Storm only (for Digital Designs)...
Can someone point me out the differences?
Thanks in advance
Morgado