Dasaita told me that MTCH is for the most recent PX6 motherboard....I assumed that they are not compatible as Dasaita publishes both mcus at the same time (mcte 3.78 & mtch 3.80)...so if I were you stay on mtce.
Anyway...if your unit is working....why tto upgrade?
MCU upgrades rarely add any feature....just includes support for new canbus boxes.