The EMEM radiates the frequencies through the air so you don't have to hold hand holds. I like to use the program capable Atelier to control the EMEM because it is tedious dialing in each frequency on the EMEM.
Also the EMEM only has a frequency range of 0-10000 Hz. The Atelier when used as a pad device will go to 20,000,000 Hz with several channels.
I use an F165 Atelier Robin. The F125 will work but has much less frequency range etc.