If you were blind wouldn't killing yourself be much more difficult?
I imagine that most blind people have regular carers and have their homes altered to protect them from accidental harm, so committing suicide would actually be very difficult. Having said that, if I was blind I am pretty sure I would try to kill myself, though it is almost impossible for me to say because I am not in that horrible situation.
On topic I would 100% rather be deaf out of the two, though I am hoping neither ever happens to me!