Quick reply, as I’ve loads to do (lol, haven’t we all!?)
I’d forgotten until the other day (when I found it in a cupboard) that the Orthotic dept tried me with a Miami collar once, following attendance at the spinal injuries unit for my yearly review. I suppose it looks more trendy, in todays fashion conscious world but in practise it’s far from ideal. I tried it on at the orthotics consultation and knew straight away, that it wasn’t as supportive at the back of my neck as the Philadelphia collar, especially for my upper neck, never-the-less they insisted I take it home and try it, which I did but it was no good, not a patch on the Philadelphia one. I notice you too have loss of lordosis in the upper neck, so I think the Philadelphia would be much more beneficial.
Also from a funding point of view, the Miami is about £100 dearer than the Philadelphia so, unless orthotics are on commission, for the NHS the Philadelphia is also more financially appealing.
I wrote a post a while ago, rating and comparing some of the other collars I’d tried and tested:-