3dsmax 2020 already got two updates.For me 2020.2 is the most stable 3dsmax version ever.However looking into the forum threads, you will still find threads about 2020.2 crashing and freezing. Does this mean, it`s an unstable, buggy release?
The only objective data for stability of a specific version can be provided by the 3dsmax development/quality engineering team, as they have the statistics about categorized crash-reports through CER.
Everything else is the subjective experience of user(s) with a specific configuration/usage. 2016 might have worked for you, but i got constant crashes with it, and i never really found the root cause for it. Might be a script,plugin, driver whatever. So for me it was one of the worst versions ever.
Most 3dsmax installations rely heavily on 3rd-party plugins,scripts that can cause all kind of issues. I still get crashes from time to time with old scenes containing a specific plugin.
Also, i can`t even tell how much i was burned by a 3rd Party Layer Manager tool, that i used ages ago.
And then there are the constant Windows 10 updates changing user permissions.Then things aren`t written to a specific file, screwing up 3dsmax config files and what not. I had .FBX import no longer working correctly after a Win10 update. After resetting UserSettings everything went back to normal.