Thanks for sharing the results of your poll. We can also check Pypi download stats for “notebook” (PyPI Download Stats) and “jupyterlab” (PyPI Download Stats). Counting each download during the last month as a “vote”, we have:
>>> notebook = 11526130; lab=2056256
>>> notebook/(notebook + lab)
0.8486086317970937
>>> lab/(notebook + lab)
0.15139136820290633