So I did put both apps on my phone, but in doing some research on them, you can't submit one on MPC and a second on GE as it supposedly messes up the system.

I will just submit on the MPC app when I touch down and then when I get to Immigration, will decide whether to go through the MPC line or go through the kiosk process with GE. I don't really want to deal with taking selfies, which the GE app requires.