Yes, I’d generally agree. In my experience, Navimow updates tend to be more thoroughly tested than Mammotion’s, with more granular changes and a clearer breakdown of what has been updated. This makes Navimow feel more reliable after firmware releases.
That said, Mammotion has been improving and is getting quicker at resolving issues. I’d recommend joining the Mammotion Facebook group and monitoring user feedback for a couple of weeks after each update before installing it.
If you decide to purchase, let me know what model you are interested in and I can send you a link, will see if any discounts are available.
All the best Mark