I like Katelyn best.
If I met a boy with the name Addison/Madison I would seriously side eye the parents. They may have started as boy's names but are def girl names now.
And until I read this thread, I didn't know Addison was a disease...I'm willing to bet most people don't and even if they do wouldn't bat an eye at the name.
I like Addison better than Madison - still Katelyn the best.
eta: corrected to your spelling!