I think you're right about perspective. I didn't consider that much before, but something will definitely affect you more or less depending on how prepared you are and what is important to you. Losing your hearing when music is such an important thing would be really hard. On the other hand, it sounds like you have some mild mobility issues that might be made better with a chair ( though that is a lot different than unexpectedly losing your legs).

For me, I've always found the thought of permanent blackness to be rather terrifying. I was the odd one out in band who would have preferred deafness to blindness. And I think the no legs one really does come down to the trauma of unexpectedly losing both legs; the lack of mobility itself might not be quite so bad.