How do y’all feel about a rubber gasket for setting a toilet to its flange VS a conventional wax ring?

On new toilets that have never been installed should be good but if you have wax coating on the bottom of your toilet, not so good and may leak

Reason for asking... someone I know has a sewage odor in that bathroom after her hubby installed
One. She smells it after a Good rain. She is wheelchair bound and with transferring
Back and forth It started to loosen up.

Usually, a rubber one is tighter, since you can squeeze it between the bowl and flange, whereas, a wax one just gets thinner and does not 'rebound' if the bolts loosen up. The only time I could not use a rubber seal was when the flange was too high and there was not enough room because the rubber could not squeeze that thin.

the toilet ITSELF is loose

the toilet ITSELF needs to be mounted 'rock solid'

the toilet should NOT move or rock or shift AT ALL

y'all need an actual plumber

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638