Default [Q] which modem?

Hey all, I am on I317UCUBMK6. I know there are newer ones and was wondering if it is a good idea to update,and to what one?
SGH-I317UCUCNE5 -- MJ4 bootloader--DN3 V4 4.4.2 beta 1-- Agni 4.2.1
Nexus 7 32Gb (2012) 4.4.4 Stock