ITSJOECOOL
I just read an article that said Google Home is better. The rationale was that Google's algorithm is superior to Bing, which Amazon's products utilize for commands. I must admit when searching on the web, I always find Google blows Bing out of the water...
I think this is especially relevant for you/your mom. My mother, now deceased, had similar type of issues due to stroke. I know that the Google product would have suited her better.
An example they mentioned about Bing was you have to construct the question a particular way, whereas Google's commands you didn't really need to do that as much. For someone with a stroke, you want it to be as simple as can be.....
Wish you and your mom the best whatever you choose!
Robert