[DarkManta]

for me MQ4 was always slower, much harder to navigate and hell lot more buggy than nox (in addition, debug logs get spammed with xml syntax errors in and more stuff)
it´s also much inferior in terms of customization. there is nothing out there which even comes close to nox in that aspect.
last big difference: support. nox gets updated daily + support is excellent whereas MQ4 has a lot of long-time-bugs which probably don´t get fixed anytime soon (or cannot get fixed at all, i don´t know)

so Nox >> MQ4. big time.