I am looking into getting a shower chair for my grandmother and would like some insights on what chair to choose.

Hello everyone,
I was looking around to see if anyone could help me educate myself on showering options for my grandma. I really don’t know much about what to expect. She is now in an standard self propelled chair that was prescribed to her but she is curious about getting a shower chair as she is concerned about what will happen with her bathing/ showering.
Any insight on what chair to chose? Comfort? Big back wheels or small ones? Affordability is always on the mind? Any chairs we should definitely avoid?

Thanks again so much, I know this probably isn’t the exact forum but I have noticed that it is one of the more helpful and used! If anyone has a recommendation on any other forums or support communities that would be extremely helpful too.

Thanks everyone for all your help!
Grandmas Helper