Cryotherapy is done more often in USA than in UK as primary treatment so you could look at American sites for more info or check the late Terry Herbert's site YANA (You Are Not Alone now) which has international connections and breakdowns by treatment. What little Cryotherapy there is done in the UK is mainly as a follow up salvage treatment and there is not a great deal about it on this forum. It so happens that I am presently on a trial for salvage treatment for failed Radiotherapy which either provides HIFU (High Intensity Focal Ultra Sound or where this is not possible Cryotherapy.
Each treatment has pros and cons in the way it is administered and potential side effects which vary from person to person. Also, some patients are more suited to a particular option or options.
It makes sense to consider all options and then choose from those you are considered most suitable for which to plump for. I assume you will have treatment in the UK and outside surgery and radiotherapy you might have to search a bit for hospitals that do less usual treatments.