Just curious to know if other members have done similar tests and with what kind of success.

I tried to copy/paste into the following outliners an excerpt from Wikipedia with math&text;.
For instance the first paragraph of this one: https://en.wikipedia.org/wiki/Hawkins–Simon_condition

Admittedly the test was done with a venerable OS: WinXP on PC (BTW three days ago this site started giving error certificate with IE8!) and with Firefox 52. Some outliners were tested also with Win10. I would be interested what happens to the Mac too.

Result A: collects text but A1: unable to show correctly math formulas or A2: not showing them at all
....ConnectedText -> A2 (tried also with Win10: same result)
....RightNote -> A1 (tried also with Win10: same result)
....MyBase -> A1 (attempts to download formulas as image, without success)
....Ultrarecall -> A1

Result B: Collects text AND math formulas correctly:
....WizNote (v.4.2, local save) (formulas where correctly turned into images)

Pasting on macOS

Outlinely -- gibberish
Bear -- gibberish
Typora -- a little less gibberish, but nevertheless not useful
TextEdit -- the worst, unreadable
Word -- text is in the right places -- math symbols are missing
Curio -- about the same result as Typora

... that said, what editor would I expect to work correctly?

Well, good for Wiznote, I say.

Result B: Collects text AND math formulas correctly:
.....also
....Zotero 4.x as full Add-on of Firefox (old 32)